Good AM fellow techs, have this t bird with an erractic tach operation. When you drive the tach will go from normal reading to red [...] also peg the needle to the down position. We leaning towards the idm module that appears the tach sends the signal to this ...

FIX posted 5/4/1998

iATN Members:
Login to view full TechHelp request
Auto Repair Pros:
Join iATN to read this TechHelp request
Vehicle Owners:
Find a nearby iATN member to repair your vehicle