Evening all, i sold a Stack boost gauge on ebay last month and the chap that bought it has just fitted it and its not working correctly.

He says it doesnt sweep when its powered up and the vac reads as boost and the boost as vac.

Now it was working perfectly when i last used it so its baffled me.

He says he has taken a live from the ecu, and there are only 3 wires to connect, live, ground and illumination. There is a sub harness to a map sensor that is already connected so you cant get that wrong.

Anyone got any ideas?

Cheers