OE Tach on 2000 Merc MTY 5.0 acting erratic. Jumps around while driving
drops to 100-200 RPM at idle, but actual RPM's not noticibly lower. Kin of seems like its almost twitching, and fading away so to speak. I there a sensor involved that I can check, or am I going to have t dismantle my dash? Also, is it possible that the TPS sensor o something like that might be starting to go? No service engine light on either..78k miles.
Anyone have any experience with this type of issue
-- MACE