My workbench looks like a graveyard for AC gauges! I took a synchro transmitter coupled to a cheap small servo which turns it using SIOC. Add one of my 115Vac 400Hz power supplies, stir in a 28V transformer, 5- wires and a real oil pressure gauge and PRESTO!
A working gauge which operates smoothly, consistently, and realistic! If i can do this, anyone can!!!!! :)