Did you ever get this resolved? I have the same gauge, brand new and it does the same thing, pegs to 220. I haven't rechecked anything yet. Was hoping you got it figured out and it was something simple. I'm a little frustrated right now because I had a mechanical gauge brand new that didn't work. I did test that one and confirmed it was no good.
What Del said in his post. I never got it to work. Bought a new one same brand. This one works , moved sensor location . Take your sensor and ground it with a wire and use a candle or cigarette lighter and see what it does.
