a couple of notes for Monster tach. Depending on how new it is it may need to be calibrated for the 5v square wave on the LS1 instead of a traditional 12V analog signal that most tachs use. Also the LS1 fires 2 times per powerstroke so you need to set up as a 4 cyl.

 

In light of this new information, which wire is the 4cyl?...how do I calibrate it for the 5v square wave(I'm not even going to pretend I know what that is)?

 

someone please address this, I got a tach sitting in my car waiting to be wired

 

white wire , in pin#10 of blue plug at PCM. It's on right side of engine bay by the firewall.

 

thank you...that should be enough info for me to be dangerous

 

but what about the orange or brown wire...which for a 4cyl...if greatwhite is correct?

 

you will need to call autometer to get the tach adjusted if it is not already for the LS1 tach signal...

 

how do they adjust it, how much does it cost?

 

Boone, Expedious...have you wired a monster tach to an Ls1 Camaro to know your advice works? if so I'll try your' approach.

 

I only had to pay shipping and handling when I sent my tach back to autometer for the calibration. Without calibration the needle bounces all over the place and is basically useless.

 

I appreciate the help. Now if I can figure out why my temperture gauge is not working

 

can i connect to the traction control switch isn't that connect to the tach somewhere ??????? thanks.

 

dunno...I would have just got a shift light myself but I got the tach with shiftlight free. Unfortunately I got to send it back to autometer to get it calibrated but for shipping and handling fees I can't really complain.

 

ttttt