Kit or Project: oil pressure gauge, water temperature, voltage, battery charge

[jtjohnston]

I suppose you've seen these?
http://store.qkits.com/category.cfm/CAR
They seem to have a decent digital tachometer.

Any one know where a newb might find an oil pressure gauge, water temperature, voltage, battery charge?
I have an old Chevelle, and although it is Gino a bit I wouldn't mind having a kit box with a few diagnostics.
Serious question. Where might I find a kit?
John