even to 10psi I see:
http://www.speedhut.com/gauge/GR-BOO...8w--warning%29
But too large for me I think (i want it in the ashtray)
I also thought about something like this in the ashtray or maybe a vent:
http://www.ebay.com/itm/200469434194
But that's not as cool as a real dial imho
That plx gauge may be a nice option.
I know these guys do a small 1,5" dial in stainless
http://www.mcdanielcontrols.com/index.htm
but that's all analog, so a boost line to the dial. Maybe nice to fit in the ashtray, like a little jewel