I removed the stock harness from my 91' Z28 and I'm in the process of installing/wiring a Holley Sniper EFI. I have a complete harness that I'm feeling a little hesitant about chopping up as I believe they are hard to come by.

If I did sell the main harness, what do I need to look for when buying a harness to put back in the car? I would like all my stock gauges and accessories to work (no heat or AC).

Thanks!

 

you are essentially going to need to interface to the C100 connector (the connector on the engine firewall driver's side) in the engine compartment and then also the C207 connector in the passenger side dash area where the original ECM was.

Search and look up the pin outs for these connectors and you can see the functions of each pin and also determine which ones you would like to have function for your set-up... for example the coolant temp gauge and oil pressure gauge

you can buy these connectors, however getting all the connectors, pins, crimping tools, etc is likely going to be more $ than you may want to spend if this is the only swap you are doing

 

I found this thread while searching for Holley Sniper info as I'm thinking about switching over to a Sniper. I also have questions about the factory harness. I don't want to destroy my harness either as my 91 Camaro Z/28 has a tpi harness. Would it be wise to find a factory harness from say an 82-84 carburated car or just make my own? Also what intake is recommended for the Sniper? How about heads? Will the factory tpi heads work fine? And the fuel pump? It has a factory replacement pump in the tank. Will it work fine or need one that works with the Sniper?

 

I've got a 91 Z28 and when I did my Holley HP unit in 2014 I just ripped out the ECM and all related engine wiring then cut and spliced into everything I needed to get it to run perfectly