Dash/Instrument Illumination: Step by Step Search

Dash issues can definitely drive you crazy. I did exactly what Del said. Tested everything on the bench. I soldered all the pins to the board and put star washers under all the screws. A pencil eraser cleans up copper board traces nicely.

A old computer power supply makes a great 5 & 12 volt supply to provide battery power & gauge power. Used ones are easy to come by, often free, or a few dollars. Lots of YouTube videos how to do it. They are pretty high powered so use a fuse.