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Originally Posted by MHeffeGMC71
I wish I could pop the back off but its an OEM style tack
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OK here is a post I made in an older thread.
I don't know what an l33 is or what ECM/PCM it uses but on my '67 with a stock tach dash & LS1 with the 411 PCM I just hooked the tach wire from the PCM to the tach output post on the back of the tach and changed the PCM resolution from 6 to 3 in the tune. Seems to work OK....
Here is what lsnova said in another post:
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Depends on what year your PCM is, but generally the 2003 and newer will need the pull up resistor. Also you'll have to change the tach resolution from 6 to 3 in the tune to make it read correctly since LS motors use a 4 cylinder signal, otherwise it will read half of what it's running (on a V8 tach). Other than that, just hook up the ignition wire like it was originally and hook the signal wire, the one that went to the coil, to the tach output out of the PCM, generally a white wire at C2 10, but that may depend on year and application.
LockDoc