I have just put my mechanical oil pressure gauge out of service since I have had problems since day one with leaks. Mostly some major cabin leaks but more recently, a large leak at the engine block connection. I just disconnected it completely and need some advice on what gauge to get to replace it with.

I want the most useful gauge for a decent price. I really want a EGT gauge, but the price and the welding factor turn me off from that one. I am looking into either an electronic oil pressure gauge or an electronic oil temperature gauge. Which would be more useful?

I also don't want a useless gauge like voltmeter, water temp, or fuel level, so those are definitely out of the question.