I have tested the gauge and sender...both are fine. I have replaced the interface board twice...no luck. Any suggestions?

I have tested the gauge and sender...both are fine. I have replaced the interface board twice...no luck. Any suggestions?

How did you test gauge and sender? We have a 97 express van that has this stuff with the fuel pump in the gas tank. Our fuel gauge moves( to the right slightly and back) when the turn signal blinks. Two blinker indicators for the price of one!!!!

The fuel pump can be causing the problem though.

Does the guage move with either right or left blinker, or just one of them?

Does the guage move with either right or left blinker, or just one of them?

The gauge moves with either blinker right or left.