Woot, my Impala came with an oil press gauge stock.
Anyway, my Interceptor gauge is on its way. I think a fuel pressure gauge would be good to have, and if I ever go some sort of F/I then of course a boost gauge.
A FP gauge is a real good investment. FI or not. OP is good as well. Volts is oooooook. I had one. It wasnt really worth it IMO.