Join Date: Sep 2000
Location: Shrewsbury, MA, USA
Re: Autometer fuel gauge pegged beyond full?
The auto meter gauge should have one built into it if it is specifically for a GM 0-90 ohm sender. GM does use different values on their more modern senders than the older 60-70 vintage cars. As long as the guage is made for a 0-90 sender it should be fine. The guage seems to act like its wired backwards going full scale when the car is off, and only coming slightly off the high scale when the key is off and the tank empty.
Go out to radio shack, buy a 0-100 ohm potentiometer, or a pack of 20, 40, and 80 ohm resistors, disconnect the connector in the trunk, stick one end of each resistor (one at a time) into the connector, and ground the other end to the body. The meter should display rougly 1/4 for the 20, a little below 1/2 for the 40, and about 7/8 for the 80, if its working correctly. You can do the same thing with the pot, just hook it up to the connector in the trunk, ground the other leg and turn the adjustment pin to see the gauge go from empty to full.
1969 Indy Pace Car
350/300HP RPO Z11
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