hey guys, i had gas installed in june but now that my engine s**t itself i decided to take it all out and run the new rebuilt motor on just petrol

Ive pretty much got everything out and im just down to the wires. Its a sprint gas system done by ezygas. They have tapped into the main loom and into the injectors, that was an easy fix but i just need a little help on where these one go.






there is 4 wires, red, 2 brown and a yellow but they go behind along the firewall but from inside the car. i tried looking at the ecu but couldn't find them, i ended up taking the headunit off also but i couldn't see them

all the other wires with the black covers are all part of the gas too. Really all the wires that came out of that hole was all part of the gas? just cant work out where the 4 wires that go behind the firewall go to.

any help would be good

Probably O2 sensor switchover.

Thanks for your help guys ill have a look now