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BAD GAUGE? 200 1980

Rice, More than likely you have a bad Temperature compensator. The same thing happened to me about 6 months ago. New radiator, pump, hoses, thermostat, even a new sender(just under intake manifold). Most of that stuff I had to do anyway. A few weeks after it started the fuel guage went wacky as well.

On the back of the instrument cluster you'll see a small rectangular (1.5 in x .5 in) brass thing attached by 3 connectors. That is the early style temp compensator. Find a used parts guy to get one. I don't think volvo has them new anymore, and if they do they'll want a fortune for it.

I don't know how to test it besides swapping in a new one. Depending on how flexible you are you might not even have to take out the cluster. Just be careful not to crack the board that it is attached to while disconnecting or installing. Good Luck
Marty






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