I have the Speedhut gauges and the Ron Francis wiring harness. My gas gauge has been calibrated and was working fine but now it has started to bounce all over the place. It will be on 3/4 then a few seconds later it is sitting on 1/4 then its pegged full. Its possessed.

I would assume bad ground of some type. If I recall correctly, the RF harness had one connection with fuel level sender and fuel level ground so the gauge was just plug and play.


Before I dig into under dash wiring, any other thoughts? Any experience with bad gauges or senders?


-Steve