DO NOT connect the Orange 12v constant wire! I've been having a problem with my EGT and Oil Temp gauges since I got them installed last weekend. The gauges would turn on at Accessory ON, and would stay at a constant level no matter what. Ivan (iv30) tried everything he could think of, but nothing seemed to change.
Ivan then decided to call Blitz USA and after explaining everything, they admitted to him that they had made a manufacturing mistake, and the Orange wire was not needed. They advised to just cut the wire and tape it off to fix the problem. I did just that about half an hour ago and guess what? They work perfectly now!
So again...don't connect the Orange wire!