my msd window switch says to connect to the tach wire from the PCM can n e one tell me which ione this is, its on a nnbs gmc 5.3, says white wire on pin #10, on trucks 2000 to 2005, would mine be the same?...

 

yeah im wanting to know the same thing for a nitrous install this weekend PLEASE HELP!

 

For the 6.0 Ben, I was told it is a green wire with white stripe that can be tapped on the coil pack passenger side. Not sure on the 5.3

 

You can get it from behind the cluster, Its a white wire- pin A4 or A5. But thats in my 03 SSS

 

yeah the nnbs clusters are different, there isnt any white wires and they arent numbered at all. I routed my wire from my msd window switch over to the passenger side coil pack, The main connector in the middle of the valve cover, there is a green wire with a white stripe. i spliced into it there put my window switch on 1 cylinder mode and it works fine. untill someone figured out which wire is the tach wire on the back of the nnbs clusters this is a whole lot easier then pulling the whole dash out.