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So, I suspect Redspider’s advice is spot on. At the battery, engine off, the battery develops 12.7 volts. Resistance from the battery negative terminal to the engine block is 0.6 Ohms. At the water temp gauge, the ground wire at the back of the gauge to the frame has a resistance of 7.2 ohms...

I am a member of those forums, but I suspected that people on this site may have more technical insight that the average Lamborghini forum visitor. Fchat is pretty good however, I have a few older Ferraris I work on myself and have gotten a lot of help from that site. Not a lot of Diablo experts...

Thanks to all that responded, especially Redspider. I can pull the cluster and find a better 12v source. That seems a possibility. I thought the heat near the alternator might be the issue. A Diablo stores its battery in the driver’s side rear wheel arch in front of the rear wheel. No...

I can pull the cluster from the dash pretty easily and have a wiring diagram. I am just not skilled enough to read it to understand where the ground(s) for the two gauges are located.

Greetings to all. Here goes my first post. My car runs well, but has some chronic gauge issues. The coolant temp needle and oil pressure needed wiggle significantly while driving, even with steady throttle. The coolant temp can swing from 80c to 100c once a second, while the oil pressure...