YOU WOULD NOT BELIEVE THIS, I HAVE THE SAME PROBLEM WITH MY TACH. ITS BEEN ABOUT 1 YEAR WITHOUT AN EXPLAINATION. IF YOU HEAR OF A CURE TO OUR WACKY TACH PLEASE CONTACT ME. JUST TO TELL YOU, MY 92 EXPLORER HAS 89,000 MILES WITHOUT ANY PROBLEMS EXCEPT THE WACKY TACH.
GEORGE AT GRSJMS@AOL.COM