65 Valiant now gauges go full when ignition key turned or running

I think I actually got the instrument voltage regulator from RTE. I think it's converted to a solid state voltage limiter and it has the red led in it. You can't hardly see it anyway on the back of the dash so it doesn't really help me. I looked through my receipts and I believe the fuel gauge recored and the temp gauge recalibrated from Instrument Specialties. They told me they just repair it to function as it would originally. Mine is all original 65 Valiant gauges. The fuel gauge and temp gauge stay up whether the lights are on or not with the key to run or engine running. The fuel sending unit and gas tank were changed maybe 2 or 3 years ago. I did change the connection on the fuel tank sending unit to an eyelet terminal with a nut holding it on because the original push on type didn't stay connected very well. The temp switch is fairly new as well. I've had the car for like 4 years now. I've tried a couple different gauges and I don't know if any have ever worked right. There's got to be some way to make them work and stay working. It has a killer transmission leak at the parking cover so I'm not able to drive it to a shop. They also recored the speedometer and it works good. The ammeter I had was no good so they replaced it with an NOS one and it works good.

nm9stheham said

What do you mean by a "new converted instrument voltage regulator"? And do you have any more details about what the gauges were 'recored' with? We need to know what was put in your system, so we can see if it compatible with Mopar parts and your sensors. In looking at the Instrument Specialties site, the say that they recore with VDO cores, which are probably not at all compatible with your Mopar sensors. Mopar sensors are pretty low resistance compared to others.

» Gauges & Clusters Instrument Specialties

Do the following: Remove the wire from the temp sensor on the engine and measure the voltage there when the key is in RUN. It should be either 5v or a pulsed voltage (depending on the meaning of that new converted instrument voltage regulator). This will tell if the regulator is doing what it should for Mopar sensors.

Does the fuel gauge still go up when the headlights are turned on?

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