Temp and Fuel gauges trouble

Hi,

Sounds like a case of- if it's not broke don't fix it. By taking things a part something was damaged. First, did you reinstall the instrument cluster in the dash frame? It needs to be mounted in the frame for an electrical ground.

Next I would suspect the connector pins that are arranged in a circle. One or more pins may have broken contact between the pin and circuit board and will need to be carefully cleaned and re-soldered. If you don't know how to do that, do you know someone who works on electronic equipment that can help you?

There are other things you can test if you have a multi-meter and know how to use it and a factory service manual for wiring diagrams but, I would start with the two things above.

The gauges will work with or without the condenser (capacitor) it's just there to keep clicks and pops out of the radio.