View Full Version : My tach is stuck at 3000 rpm ....

06-09-2006, 02:09 AM
At least the engine isnt. What could cause this? Its been off by
at least 1000 rpm since I got the car, then I found that the cigarette
lighter was disconnected, after I hooked it back up the tach went bad.

Oh .. 63 Avanti R1 .. manual trans .. etc. Where does it hook up?
Anyone have a link to a wiring diagram for it?


"Tactful". Thats my new word, I will attempt to be "Tactful Tom" and
not "Negative Tom".

06-09-2006, 09:15 AM
Start with the wiring diagram in the shop manual. Chances are it's the tach head if the pointer is stuck with no electrical power to it. These have a sender up under the dash mounted to the metal cross brace. It's in a round metal container, about 3" in doa. Check all wires for freying or loose connections. Yopur comment about the lighter... bay be a short somewhere. Hope this helps:)

06-09-2006, 10:31 AM
Avanti wiring here (click to enlarge)


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06-09-2006, 05:05 PM
OK, update. I drove the car to work today (boy do I need an exhaust),
and the tach is now moving again. Its off by 1000 rpm (at least). I
think its a connection issue (image that! On an Avanti??;)). Thanks
for the input guys, I will check out the pic JDP.