my tachometers needle is pinned all the way to max rpms which i think is like 6 or 7K. i have taken the positive+ negative , and 2 other wires off and plugged them back in on the back of the tach. the needle is still pinned, and i have no idea why. i tried tapping on the gauge and still no luck..is their a wire that goes from the tach to the distributor or computer?. btw this isnt on a car or bike rather my boat. thinking its a bad tach, i have posted on my boat forums as well.