Which I guess is to help get the car up to temp. Anyway, I'm using an electric gauge I put in the car but after getting these numbers I double checked it with a known good, accurate mechanical gauge. A local Z owner has a 90 TT, anyone know if that will work with a 95?
Oh and, if you just want to get a ball park figure for PSI drop per second/minute after turning the key to Ignition that would do fine.