I've installed a '66 gauge cluster in my '65. I installed a oil press sending unit for the gauge and reconnected everything correctly (to my knowledge) but the gauge pegs when I turn ignition on. I installed the constant voltage regulator and confirmed the 5 - 6 volt average. Gauge cluster was swap meet fodder. Any ideas. Am I missing anything besides the gauge being bad? It only has two connections (sender and power) and I ran a ground wire to the back of the cluster. Any help would be appreciated.