Help! Atr air fuel ratio instructions

gripsgn

Member
Joined
Aug 5, 2007
I have lost my instructions to the ATR air/fuel meter/gauge that I had in my car. It only has three wires and I need this asap. HELP!!
 
Instructions

It is not for WBO2. I have sold it and I had the instructions to send with it. Just trying to get them.

Thanks
 
Wiring

It has a red, black and grey wire. I know the black is a ground, the grey goes to the o2 sensor, and the red wire should be a hot. I think it should go to a hot that comes on with the ignition switch. Am I correct on this?
 
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