User Tag List

+ Reply to Thread
Results 1 to 22 of 22

Thread: Mk1 Rev Counter

  1. #1
    Mechanic MightySprocket's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Jul 2006
    Location
    Cheshire
    Age
    50
    Posts
    585
    Thanks
    19
    Thanked 8 Times in 8 Posts

    Mk1 Rev Counter

    having just re-fit the whole car the only thing that doesn't work is the rev counter does anyone have any pics of how it should be wired.
    What is the wire on the back of it that has bullet connectors and is joined together?


  2. #2
    Racer Decade Plus User Willid1's Avatar

    Join Date
    Dec 2001
    Location
    Hertfordshire
    Age
    60
    Posts
    3,062
    Thanks
    3
    Thanked 21 Times in 20 Posts

    Re: Mk1 Rev Counter

    I assume you ahve a 6 dial dash and the car has the correct loom to make it all work.

    The wire with the bullet connectors forms an inductive loop. You should see a small threaded post on the back of the tacho.

    There should also be a small u shaped piece of metal which with a small knurled nut holds the wire close to the post.

    Then it should work.

    Sorry don't have any pictures.

    HTH

    David

  3. The Following User Says Thank You to Willid1 For This Useful Post:


  4. #3
    Mechanic MightySprocket's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Jul 2006
    Location
    Cheshire
    Age
    50
    Posts
    585
    Thanks
    19
    Thanked 8 Times in 8 Posts

    Re: Mk1 Rev Counter

    Quote Originally Posted by Willid1 View Post
    I assume you ahve a 6 dial dash and the car has the correct loom to make it all work.

    The wire with the bullet connectors forms an inductive loop. You should see a small threaded post on the back of the tacho.

    There should also be a small u shaped piece of metal which with a small knurled nut holds the wire close to the post.

    Then it should work.

    Sorry don't have any pictures.

    HTH

    David
    cheers the loop wire is just connected to its self at the moment, what should it be connected too, it had 6 dial clocks in it before but they were knackered so I replaced them with these... however I took them out 2 years ago and cant remember how it was wired

  5. #4
    Mechanic RS2KPETE's Avatar

    Join Date
    Jun 2008
    Location
    Not far from Lydden Hill Kent
    Age
    66
    Posts
    620
    Thanks
    6
    Thanked 14 Times in 14 Posts

    Re: Mk1 Rev Counter

    the loop has to go in sieres with the coil LT - Points, if you have electronic ingnition you ma have to make up some sort of a switched load ( 21w lamp willdo) or more turns on the loop to increase inductance.

  6. The Following User Says Thank You to RS2KPETE For This Useful Post:


  7. #5
    Decade Plus User
    Turbosport Subscriber
    Dave's Avatar

    Join Date
    Oct 2003
    Location
    Cheshire
    Posts
    23,117
    Thanks
    167
    Thanked 694 Times in 516 Posts

    Re: Mk1 Rev Counter

    Behind the dash there should be two bullet connectors joined togther (I thinkl the wire is black, but it might not be). Split them and use the white wire on the rev counter to connect them back together.



    If you have fitted an electric dissy with a 12volt unballasted system you may have bypassed this wire, so that won't do it.
    In that case the white wire on the rev counter has to be fitted in the feed to the coil somewhere.

  8. The Following User Says Thank You to Dave For This Useful Post:


  9. #6
    Mechanic MightySprocket's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Jul 2006
    Location
    Cheshire
    Age
    50
    Posts
    585
    Thanks
    19
    Thanked 8 Times in 8 Posts

    Re: Mk1 Rev Counter

    cheers fellas, think i've got it now

  10. #7
    I used to be: steely dan Decade Plus User
    Turbosport Subscriber
    Turbosport Moderator
    Dan's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Aug 2006
    Location
    north london
    Age
    41
    Posts
    5,765
    Thanks
    131
    Thanked 127 Times in 121 Posts

    Re: Mk1 Rev Counter

    now your sorted i can hijack the thread

    does anyone have a pic/diagram of the back of the tacho... ive got to connect it to my Megajolt... i have one wire with the rpm feed but think i have to connect it to two wires, havent a clue which ones.. im guessing i try the white one, and if that dosnt work connect that and the threaded bar with an induction loop type thing

  11. #8
    Mechanic MightySprocket's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Jul 2006
    Location
    Cheshire
    Age
    50
    Posts
    585
    Thanks
    19
    Thanked 8 Times in 8 Posts

    Re: Mk1 Rev Counter

    no problem mate, good luck with that!

    PICTURES SPEAK A THOUSAND WORDS so lets have em

  12. #9
    Decade Plus User
    Turbosport Subscriber
    Dave's Avatar

    Join Date
    Oct 2003
    Location
    Cheshire
    Posts
    23,117
    Thanks
    167
    Thanked 694 Times in 516 Posts

    Re: Mk1 Rev Counter

    I'm not sure the Mk1 rev counter can be made to work with megajolt. It works differently to an electronic revcounter. I have heard of them being converted to electrical though.

  13. #10
    I used to be: steely dan Decade Plus User
    Turbosport Subscriber
    Turbosport Moderator
    Dan's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Aug 2006
    Location
    north london
    Age
    41
    Posts
    5,765
    Thanks
    131
    Thanked 127 Times in 121 Posts

    Re: Mk1 Rev Counter

    thers an extra circuit i have to make so that it generates the right pulse for the tacho,


    only problem is ive lost the wires that connected the coil to the tacho, so having to pull the dash off to find out wich one i should put this feed into... i may just sack it off and buy a new tacho instead.. might be easier

  14. #11
    Decade Plus User
    Turbosport Subscriber
    Dave's Avatar

    Join Date
    Oct 2003
    Location
    Cheshire
    Posts
    23,117
    Thanks
    167
    Thanked 694 Times in 516 Posts

    Re: Mk1 Rev Counter

    I might well be wrong Dan, but I think that may be how to make the tacho work in a Mk2.
    The way I understand it is on a Mk2 the tacho is at the end of a piece of wire connected to the coil and measures what is going on at the coil.
    On a Mk1 the tacho has a piece of wire near it (the white wire that isn't connected to the tacho at all) and measures what the electric is doing on its way to the coil.
    On a Mk2 if you disconnect the tacho, just the tacho stops working.
    On a Mk1 if you disconnect the wire the engine stops as that is the supply to the coil.

    Summat like that anyway.

  15. #12
    I used to be: steely dan Decade Plus User
    Turbosport Subscriber
    Turbosport Moderator
    Dan's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Aug 2006
    Location
    north london
    Age
    41
    Posts
    5,765
    Thanks
    131
    Thanked 127 Times in 121 Posts

    Re: Mk1 Rev Counter

    hmmm
    problem is there is no dizzy or coil anymore. just a coilpack and megajolt... when i finally get the dash apart i'll find out whats what... cheers anyways

  16. #13
    Spanner Monkey justmental's Avatar

    Join Date
    Jun 2008
    Location
    dartford
    Age
    54
    Posts
    391
    Thanks
    1
    Thanked 7 Times in 7 Posts

    Re: Mk1 Rev Counter

    dave you are right the mk1 tacho works on pulse from the coil feed wire
    which is black thats near the multi plug for the dash.
    i have known of them being rebuilt to be electric tacho but as to who does it i am not sure.

  17. The Following User Says Thank You to justmental For This Useful Post:

    Dan

  18. #14
    Decade Plus User
    Turbosport Subscriber
    Dave's Avatar

    Join Date
    Oct 2003
    Location
    Cheshire
    Posts
    23,117
    Thanks
    167
    Thanked 694 Times in 516 Posts

    Re: Mk1 Rev Counter

    I thought I had read somewhere that Speedy Cables could do it. Seemed a bit odd as I thought they were a cable company.
    But they do.
    http://www.speedycables.co.uk/

  19. The Following User Says Thank You to Dave For This Useful Post:

    Dan

  20. #15
    I used to be: steely dan Decade Plus User
    Turbosport Subscriber
    Turbosport Moderator
    Dan's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Aug 2006
    Location
    north london
    Age
    41
    Posts
    5,765
    Thanks
    131
    Thanked 127 Times in 121 Posts

    Re: Mk1 Rev Counter

    cheers guys.. guess i'll aim for the black cable, connect it up and see what happens

  21. #16
    Mechanic MightySprocket's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Jul 2006
    Location
    Cheshire
    Age
    50
    Posts
    585
    Thanks
    19
    Thanked 8 Times in 8 Posts

    Re: Mk1 Rev Counter

    got this incase it helps anyone else out
    Attached Thumbnails Attached Thumbnails rev counter wiring.jpg‎  


  22. #17
    I used to be: steely dan Decade Plus User
    Turbosport Subscriber
    Turbosport Moderator
    Dan's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Aug 2006
    Location
    north london
    Age
    41
    Posts
    5,765
    Thanks
    131
    Thanked 127 Times in 121 Posts

    Re: Mk1 Rev Counter

    well i finally got the dash off today, and it looks like its the wrong type of tacho to work with megajolt... as it has the inducton loop bit

    have to buy a new tacho then

  23. #18
    Decade Plus User
    Turbosport Subscriber
    Dave's Avatar

    Join Date
    Oct 2003
    Location
    Cheshire
    Posts
    23,117
    Thanks
    167
    Thanked 694 Times in 516 Posts

    Re: Mk1 Rev Counter

    Ask speedy cables how much to change it Dan.
    Got to be better with the original one in there.

  24. #19
    I used to be: steely dan Decade Plus User
    Turbosport Subscriber
    Turbosport Moderator
    Dan's Avatar

    My 1st Project
    My 2nd Project
    Join Date
    Aug 2006
    Location
    north london
    Age
    41
    Posts
    5,765
    Thanks
    131
    Thanked 127 Times in 121 Posts

    Re: Mk1 Rev Counter

    just bought one one ebay for 20quid.. only just realised its 80mm and i think escort dashes have 100mm holes in them still its cheaper than the 55quid speedycables have on their site to recalibrate the old one.. i wanted to make a custoom dash anyways

    hopefully it'll work i dont like driving around without a tacho and this new engine which keeps asking me to thrash it

  25. #20
    Spanner Monkey

    Join Date
    Nov 2005
    Location
    preston
    Age
    49
    Posts
    326
    Thanks
    0
    Thanked 5 Times in 5 Posts

    Re: Mk1 Rev Counter

    good job i found this post as i need to no this

  26. #21
    I support TS Decade Plus User
    Turbosport Subscriber
    Miniliteman's Avatar

    Join Date
    Feb 2004
    Location
    the Netherlands
    Posts
    4,747
    Thanks
    27
    Thanked 535 Times in 489 Posts

    Re: Mk1 Rev Counter

    I know it's an old post but I changed the wiring diagram a bit:
    Mk2 tach is connected to coil - side.
    Attached Thumbnails Attached Thumbnails rev counter wiring2.JPG‎  


  27. #22
    World Champion Decade Plus User popuptoaster's Avatar

    My 1st Project
    Join Date
    Jan 2003
    Location
    Brentwood, Essex
    Posts
    9,508
    Thanks
    2
    Thanked 23 Times in 22 Posts

    Re: Mk1 Rev Counter

    Mk1 tachos are never accurate anyway, best off buying a small aftermarket one and taking it apart to fit behind the mk1's dial, bet its cheaper than a conversion.

+ Reply to Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts