*2. I bought a tacho on ebay for my 2000 Prostar and found it was for the later brainbox. Tacho worked fine but nothing showed in the lcd screen. Is it the original gauge? There must be a separate wire for current to the gauge, as I believe the ignition only has to be turned on to clock up hours.
huh. To my knowledge all the plugs are interchangable for the dash. Think we are overcomplicating this. It should just be.........buy a new one and the hours will show up. Greatlakes and ebay has some under 100 bones. Either that or find a fellow tt member in your area that will let you plug your tach up to theirs to test it.