Hey guys, have a 1995 S10 that I swapped with an LM4 out of a trailblazer. The tachometer in the s10 doesn't show rpm with the engine running. I have heard you have to have a "pull up wire" with a resistor to boost the signal into the tachometer. I don't have that wire put in yet.

Going thru the tune, I noticed this Tach pull-up enable feature under System->Tach->B5402.
Currently it is set to yes, and my tachometer doesn't work. Do I need to change this to "No" before I wire in the Pull Up wire ? Just curious as to what its function is, and to get my dash to read RPM's.

Let me know, thanks!y