Voltage regulator dart rallye cluster?

Thank for the compliment 66fyssh. That article took a LOT of research, but I came across most of the problems myself. Liquidspine, call D&M. They should be able to sell you a separate IVR and tell you how to install it. If you don't want to spend the money, that would be an option. I'd fix the gas gauge and have things working as designed, but that is just me. You can test the temp and oil pressure gauges with two flashlight batteries. Since the IVR puts out about 5 volts, 3 volts from two flashlight batteries will put the gauges up to around 1/2. You can test the gas gauge the same way if you connect the batteries to the correct two terminals.