Intermittant gauge/light issue w/electric issues...

With guages acting whacko, look to you ignition switch to be the culprit. Pretty common on our platform.

Had the same issue last year. Apparently these things operate on two separate data systems of some sort. A high speed and a low speed. The engine, tranny and such run on the high speed. And things such as the door control modules(for the windows, locks, heated seats, etc), radio, gauges, a/c, and who knows what else runs on the low speed. If one of these things mess up, or is going out it will screw everything else up that is on that system. My passenger window controls had been going out for awhile and I hadn't fixed it, then I started having exactly the same symptoms as you. Took it to an automotive electrician and he found the bad module, unplugged it, and everything was fine. Bought a used one on eBay for $35. Problem solved. Since then, my oil pressure gauge has been dropping to zero at an idle, about a month or so of this. Two days ago, all those same symptoms came back. Exact same symptoms. I'm online right now, looking for where that sensor is located so I can unplug it or replace it to see if that's the root of my problem this time. My suggestion is that you've been having a problem of some sort like this-that's where I would start. Shadetree mechanic here, not a pro but I'll try to answer what questions you have if I can. JFRagland76@gmail.com