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66 MK1 GT rev counter

 
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 298
Location: Saskatoon, Saskatchewan

PostPosted: Thu Jul 11, 2019 7:22 am    Post subject: 66 MK1 GT rev counter Reply with quote

Looking for the above. Mine must need rebuilding which isn't cheap. Mine currently reading 5,000 rpms at 60 mph, bouncing a little and changes slightly from day to day so I'm thinking it's toast. I need one already converted to negative earth. Just seeing what my options are and whether or not it's worth rebuilding or replacing. I have a price from Nisonger, anyone know of anywhere in Canada or elsewhere that I can get pricing too, thanks.
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Brett Wilkie



Joined: 16 Sep 2012
Posts: 1384
Location: Vancouver British Columbia Canada

PostPosted: Thu Jul 11, 2019 9:42 am    Post subject: Reply with quote

I had or still may have one that was converted but I would have to have a long look for it, I also could not say if it works at all as I never used it because I had a few Mk2 tachs as well. I also noticed that the Mk2 tach I used was jumpy and inaccurate, I eventually bought a small Bosch unit.
I am sure that you must have seen this regarding changing the ground but here it is. There is no rocket science to the job.

https://www.lotus-cortina.com/electric/convert.htm
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 298
Location: Saskatoon, Saskatchewan

PostPosted: Thu Jul 11, 2019 9:49 am    Post subject: Reply with quote

High Brett, yes I did the + to - ground conversion and it does work, just very inaccurate, I guess it’s just old and tired. If you can find your old one I may be interested. Thanks
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peteleo



Joined: 24 Aug 2008
Posts: 1135
Location: San Mateo,California

PostPosted: Thu Jul 11, 2019 2:27 pm    Post subject: Reply with quote

If Brett doesn't have one. I have a MK1 GT converted to -grd. and tested with a square wave generator. These old analog units won't stay accurate for long as the components are >50 yrs.

There is a video that shows how to convert one and venders that will convert your Tach to a digital unit.

http://www.nisonger.com/electric-tachometer-conversions.htm

https://www.youtube.com/watch?v=ddZ0E2Wd6Ic

http://www.dinoplex.org/tachoconversion/
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Brett Wilkie



Joined: 16 Sep 2012
Posts: 1384
Location: Vancouver British Columbia Canada

PostPosted: Thu Jul 11, 2019 9:29 pm    Post subject: Reply with quote

peteleo wrote:
If Brett doesn't have one. I have a MK1 GT converted to -grd. and tested with a square wave generator. These old analog units won't stay accurate for long as the components are >50 yrs.

There is a video that shows how to convert one and venders that will convert your Tach to a digital unit.

http://www.nisonger.com/electric-tachometer-conversions.htm

https://www.youtube.com/watch?v=ddZ0E2Wd6Ic

http://www.dinoplex.org/tachoconversion/

Those are interesting videos, good info.
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peteleo



Joined: 24 Aug 2008
Posts: 1135
Location: San Mateo,California

PostPosted: Thu Jul 11, 2019 9:44 pm    Post subject: Reply with quote

Forgot to mention that I wrote an article on MK1/2 tachometers on my blog
a couple of years ago:

https://englishfordparts.blogspot.com/2011/09/sevicing-english-ford-cortina-mk12.html
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 298
Location: Saskatoon, Saskatchewan

PostPosted: Mon Jul 15, 2019 7:30 am    Post subject: Reply with quote

Followed your instructions Pete and all is now good, the hardest part was getting the rev counter back out. Drilled a hole in the casing for future adjustment. Thanks to all, didn't even know this was something you could adjust, this site is a wealth of information and saved me buying a replacement.
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Brett Wilkie



Joined: 16 Sep 2012
Posts: 1384
Location: Vancouver British Columbia Canada

PostPosted: Mon Jul 15, 2019 9:40 am    Post subject: Reply with quote

1970 cortina GT wrote:
Followed your instructions Pete and all is now good, the hardest part was getting the rev counter back out. Drilled a hole in the casing for future adjustment. Thanks to all, didn't even know this was something you could adjust, this site is a wealth of information and saved me buying a replacement.

This Forum is a great place to share info, do you still want me to look for the tach? I haven't had the chance yet to look in my parts storage but will be there today.
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 298
Location: Saskatoon, Saskatchewan

PostPosted: Mon Jul 15, 2019 9:57 am    Post subject: Reply with quote

No I think I’m good now Brett, very much appreciated.
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peteleo



Joined: 24 Aug 2008
Posts: 1135
Location: San Mateo,California

PostPosted: Mon Jul 15, 2019 11:00 am    Post subject: Reply with quote

Good to hear you got it working properly. It it ever stops working it's usually a zener diode failure. Easy fix as you have removed the cover before.
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Brett Wilkie



Joined: 16 Sep 2012
Posts: 1384
Location: Vancouver British Columbia Canada

PostPosted: Mon Jul 15, 2019 12:57 pm    Post subject: Reply with quote

Let us know how it works out, I should check all my instrument bits to see what's worth saving?
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