speedo and tach or different. speedo can be anything from tranny gearing to how worn your tires are
Originally Posted by Tkaczuk
TACH!!! Or Tachometer. None of them are super accurate. Swapped eta to 7k Tach in my e30 before the M52 swap and noticed it was off. Many others have said BMW Speedo's and Tach's are all just off. Friend with a E90 his is 7mph off. Eta/M52 is 5mph off.
tachs are off the pulses to the #1 cylinder, so alot more accurate
I know a lot about cars. I can look at a car's headlights and tell you exactly which way it's coming