65 GT style gauges. I accidentally shorted the IVR a few weeks ago. Decided to try my hand at making one. Gauges worked fine at first but the oil pressure gauge started working intermittently and eventually quit working. Went back to a repop Ford style IVR, replaced the gauge and sending unit. The new gauge worked for about 10 minutes and quit. The other gauges seem to be working but the temp gauge seems to be moving around quite a bit and I dont trust it at this point. The ground for the instruments seems fine. I'm out of ideas.