Ok ive seen this on a car I was working on the other day ago. A 3 bar map sensor wired in a loom and a vacumn hose on the 3 bar sensor. The ecu had no vacumn hose where the port stick out of the ecu so i assumed its a 3 bar right!
So can i convert a 2 bar ecu to a 3bar and use on of the auxillery wire to make it work or NO ? The lt10 has several extra auxilley wires for what?

 

nope

 

that was pro a haltech