hello,

does anyone know how to test the speedometer/odometer when it's out of the vehicle>? i got a 86 420SEL (it has an electrical wire instead of an cable that goes to the speedo head). i know how to test the old style cable driven one (put a drill to the back of the speedo head), but i don't know how to test an electronic one. how exactly does it work? ( does it get a volt signal from the tranny?) any help will be appreciated