HELP new & dumb

[72realls1]

This is my 1st time posting, and i have a 72 c10 im doing a ls swap and trying to figure out how to wire my vss, I've a wiring harness form psi and a autometer vss 5291 how do i wire it to harness?

[BR3W CITY]

It should wire to the VSS signal wire (pin) on your ECM. The device you have is designed to function in place of a factory VSS on the trans.

What year and vehicle is the motor out of?
Late GenIII should be to Pin 21 on the ECM connector (VSS High)
Pin 20 is the Low Signal if your sensor needs it.

To make life easy:
http://lt1swap.com/2004vortec_pcm.htm

[72realls1]

motor is out of a 98 vette but i did psi conversion wiring harness so computer is 99 newer style dont know if that makes a difference i'm a fan of your by the way

[BR3W CITY]

Originally Posted by 72realls1

motor is out of a 98 vette but i did psi conversion wiring harness so computer is 99 newer style dont know if that makes a difference i'm a fan of your by the way

Well thanks for subbing/following to my junk if you are. Should still be pin 21 @ the ECM. Purple and white on the 99-02 Fbody wiring diagrams.
The "low signal" would be the other wire if its a 2-wire hookup.

[72realls1]

I figured out the wiring harness, green low signal, and purple high signal. My question is how to hook it up to my auto meter VSS 3 wire red pos+ black neg- white signal? Will it work? Do I need a different setup? if so, what? Thanks again for all of your help.

[BR3W CITY]

Red is switched power, black is ground, white goes to the VSS Pin

[72realls1]

thank you