I would like to build in some of the instrument used in airplanes in my car. . They have to work but not have a certificate or something like that. So i have 2 questions
1 Anybody have experience with it?
2 a good not too expensive source
Ebay is a good source for old aircraft indicators. I've managed to collect all the instruments for a P-47 and a P-40 from there over the course of several years.
If you really want to make it look like a modern aircraft instrument panel, you would have a tv screen setup for a glass cockpit. Then all you would need is software and switches. There may be a chance to fi d out of date instruments at aircraft graveyards.