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Tachometer question on my M35A3 ?

46
17
18
Location
Chester , VA
my tac just stopped working and not only I like all the gauges to work but the tac has the hour meter on it and I need that ....I have checked the wires at the alternator but they all look good ...so now im going to check the wires behind the tac ....but it would be nice to hear from y'all on this ....I appreciate all your expertise and opinions ! thank you all and merry Christmas
 

Menaces Nemesis

"Little Black Truck" Conservator
Steel Soldiers Supporter
333
261
63
Location
Denver, Colorado
DOH! just saw you have an A3. I know on the A2 the tach is cable-driven via adapter on the front of the engine, so either the drive adapter, cable, or tach would be broken or disconnected on an A2, don't know about an A3 though.
 
Last edited:

Monkeyboyarmy

Well-known member
1,337
192
63
Location
Kingsville,Oh.
The A3 uses a magnetic pickup that is located in the bellhousing. Sometimes they get dirty but they are adjustable in and out for a specified gap to the flywheel.
 
46
17
18
Location
Chester , VA
I took the tac out of dash and found that its not cable driven , its electronic . I did find a ground that was loose and fixed that but the tac and the hour meter on it still don't work .
 

WillWagner

The Person You Were Warned About As A Child
Super Moderator
Steel Soldiers Supporter
8,370
2,326
113
Location
Monrovia, Ca.
Pull the sensor from the flywheel housing, clean the end with a rag, no need to use a liquid cleaner. Make sure the potting material is not loose and the magnet is in the end of the sensor. Re install until it GENTLY touhes the ring gear, back it off 1/2 turn and LIGHTLY lock the nut down, IIRC 5-8 in lb...remember the pick up is thin aluminum.
 
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