Dash lights

I have the same problem with my 67 Barracuda. pulled the instrument panel out today and this is what I have found so far. Headlamp switch was corroded and dimmer contacts almost worn off. The pins for the round plug on instrument cluster had on pin missing and three others loose. Cleaned the circuit boards with steel wool and tested lamps. Found two lamps working as should and the rest would only give a dim light even on test bench, one completely dead. Traced wire from an aftermarket oil pressure gauge and found it to poorly spliced into orange wire for instrument cluster. I'll see if I can get a new switch and lights tomorrow and am hoping that the instrument lights work. My fuel, oil pressure and water temp gauges are not working so I'll see if I can test them as well. Any known common problems on the gauges?