Tachometer Servicing

Article written by Glenn Wallace – Published on 2006-04-02
MG Experience Library – Service:Electrical and Instruments Section
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Copyright © the author and published by permission or under fair use.

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~ Tachometer Servicing ~

Article by Glenn Wallace – Published 2006-04-02

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Member Comments on this Tachometer Servicing ↵

Comment by Andrew Bird at 2009-01-19 16:10:07

I thought I would add some pictures of the tach out of my 70 GT.

http://www.andrewbirdonline.com/pictures1/Tach/Tach.JPG

http://www.andrewbirdonline.com/pictures1/Tach/Tach2.JPG

http://www.andrewbirdonline.com/pictures1/Tach/Tach3.JPG

http://www.andrewbirdonline.com/pictures1/Tach/Tach4.JPG

The first and last picture show the capacitor that usually fails. I replaced
mine with this capacitor from RadioShack:

http://www.radioshack.com/product/index.jsp?
productId=2102479&cp=2032058.2032230.2032267&pg=1&allCount=100&fbn=Type/Electrol
ytic+Capacitors&f=PAD/Product+Type/Electrolytic+Capacitors&fbc=1&numProdsPerPage
=100&parentPage=family

Comment by Ingo Berger at 2012-03-05 16:23:20

1974 1/2 BGT, After 3 years tacho failed, al connection look ok & clean, added earth wire to stub on back, no result. Am hopeless with wiring diagrams.

Comment by Robbie P at 2012-04-13 22:14:35

where can i find this info on a 65 midget positive ground where the system has been upgrades to an electronic ignition,new coil, and new generator? Tach now runs at +2,000 to + 2,00rpm's. Is there an internal adjustment in the tach or is there a way to put a resistor in line to correct for what appears to be either an increased voltage or amperage or both ovet the old points system when the tach worked fine. it is an ome replacement which worked with the old ignition system. Any fix it ideas?

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