Hi can some one help i have just fitted a digital boost gauge to my sooby and it is not working properly when my engine is of it reads 0 but when i turn my engine on it gos up to 64.4 and the warning light is on and when i rev it gos down can some one help and tell me y thanks

 

Sounds like it's wired back to front if that's possible. Try swapping earth and feed wires around.

Damien

 

done that mate sill the same thanks

 

Isn't that just the openingt sequence. I had a digital one on another car, it used to do that when it was just connected to a live. You'll need to give us more info on how you have wired it before anyone can help. Is it wired to the sender?