I was wandering what gauge I should put in a a piller? I have a A/F ratio gauge I just need some addvice on what other one I should gat[?|]

Its a matter of personal taste...you could put in an oil pressue guage depending on if you would use it or not...only my opinion, its up to you...

Yes... ask yourself what you would need to know... or... what would you like to know.... or.. if it's just for show, don't even hook it up. I don't know why I would even need to know voltage, but some people like it.