DX 33 Gauges

[pedalstomper78]

I'll keep this short and sweet. My gauges on my DX33 seem to read low. I can fill the tank and the fuel gauge never seems to read full. I've got a new thermostat and the temperature never comes out of the blue.

Is there a ground for the dash that gets corroded? Does anyone know the ohm ranges for the gauges?

 

[pedalstomper78]

I figured I would boot my post to the front of the line to see if I get any help again. Thanks!