Goughary

For just keeping one in the car, I have an old VDO guage. Works well and is small enough for the door pocket. Sierra madre sells a leather case for the old Messko guages, and the VDO guage fits in there. So, easy to keep in the car. Looks to be about the same size as the guage Vic_S suggested...

Indycam

Dräger

hamah

I recently got one of these BMW gauges. I paid a little bit more than this price but when I saw it I had to buy it. Great gauge and works way better than my old digital gauge that I always had a problem getting a good seal to the valve with.

http://www.pelicanparts.com/catalog/...HOLB11_pg8.htm