Non rallye fuel gauge accurate??

It's a crap shoot. Any "precision" instrument that old is subject to suspicion, but you CAN check gauge accuracy. Go down to Radio Shack and get some resistors, and substitute them from the sender wire to ground. You can check the temp gauge the same way. Checking both gauges also gives you an idea of the limiter accuracy -- as say, both gauges read off by the same amount might be the limiter rather than both gauges.

You need to be sure the board connections are good, including the gauge studs and the socket for the limiter, AND make sure you have a good limiter.

The info I have is

L = 73.7 Ohms (empty)
M = 23.0 Ohms (1/2)
H = 10.2 Ohms (full)

So about 25 ohms will give you a 1/2 scale reading, example.


Also, opinions are that most some of the repop senders seem to be less than good. Some guys have diddled them by bending the arms, and adding a little bit of series resistance to get the range of reading right, IE many of the repops seem to NOT want to go to full, after getting the empty end reading right. This is a sender design issue.