This may be a dumb question but are tachometers car specific. I dont have one in my car but I am thinking about using one from the shop temporarily cause I want to see when vtec engages if it is at all. I know we have a few 5" autometers laying around but they are the liquid filled ones and have "FORD" on the face of them. We used them in racecars. Oh and redline on the sir2 is 7800 correct?....thanks.