Was there an optional air pressure gauge that fits our dash?

[davepl]

For about a year+ I've had an eBay wishlist looking for an air pressure gauge that would fit our dash (where the spare, or the Vacuum gauge is often placed). I was hoping maybe they had them in the C60s and I'd find one.

I've never come across one. Did they even exist? Anyone have one or a picture of one?

I'm also curious what the range is. If I could find a good gauge, I've got a factory GM compressor and would like to set up an air system, but never made it past the idea stage because I can't find a gauge!