tach wire 1991 c1500

[shortchevy]

I just swapped a carbed motor into my truck, my cluster has a tach but I dont know which wire to connect to the HEI distributor. anyone here know which wire is the tach wire on the tbi unit?
Thanks in advanced!

 

[fun4me]

The pink wire is the switched power wire. The white one is for the tach signal for the gauge. The purple & white one is for the tach signal for the pcm.

 

[nine4gmc]

i think the white wire on the distributor is the tach, i know the white wire on the cluster is.