MitsuStyle - View Single Post - Tach won't go all the way down when revs drop

FattyBoomBatty · 11-30-2008

My quest has a problem. stock dsm wiring harness, the AEM gets a good rpm signal, it sounds like the right rpm displayed on the screen. On the DSM harness, there was a spare wire coming out for the tach which I used to connect to my stock wire.

It is unshielded and runs past several other wires and electronic things on its way throught the dash to the tach. Does this wire need to be shielded or have some kind of capacitor in it to filter noise? the needle on the gauge hangs up close to 2000rpm all the time unless I rev past that point.

11-30-2008	#1
FattyBoomBatty Banned Join Date: Dec 2003 Location: Boulder, CO Drives: Conquest Posts: 5,049	Tach won't go all the way down when revs drop My quest has a problem. stock dsm wiring harness, the AEM gets a good rpm signal, it sounds like the right rpm displayed on the screen. On the DSM harness, there was a spare wire coming out for the tach which I used to connect to my stock wire. It is unshielded and runs past several other wires and electronic things on its way throught the dash to the tach. Does this wire need to be shielded or have some kind of capacitor in it to filter noise? the needle on the gauge hangs up close to 2000rpm all the time unless I rev past that point.