Skip: It's always good to see you back sharing on the forum. Regarding the mechanical gauge, I also get intermittent zero-to-fifty readings on my oil pressure gauge, and I'm fed up with cleaning the terminal so often that there is little left of the screw. I tried Corrosion Block and it last longer, but eventually I get the same problem. Since part of my plan for the ER includes installing several monitor cameras, I decided to put a gauge manifold for fuel filter vacuum, oil pressure, water temp, tranny temp, etc. in the ER with a dedicated camera to monitor the guages, another at the front of the engine for belts, bilge and thru-hull strainer. Alsoi one general camera that can overlook the engine, tranny and shaft seal. Watching the helm gauges bounce around are torture for me.
For the trouble, wireless monitors that plug into existing electronics (even night vision units) are just too affordable to ignore anymore.