Well i bought this a pillor and it came with a volt and af guage already in it. Gona use these before i go FI. but ok the volt works fine. The af gauge however is not working right. Black ( ground), Red ( power), Purple ( lights?), and a gray one??? I dont know where to wire the gray or if i wire the purple one right? I've tried the search button and its not really helping. Read one where it says to wire the purple wire to the c16 white wire going to the ecu. If i did that then where does the gray one go? Anyone can help it would be great....

 

The Air/Fuel gauge (assuming its the one with a bouncing LED) gets wired to your o2 sensor wire. I dont recall wether its the primary or secondary o2 that needs to be tapped, and I also dont remember what harness it is on. Hopefully someone will chime in, if not, Ill take a look in my manual, and let you know.

 

man i wish i had a manual to start with.

 

Which AF gauge is it? Who makes it and what is the model?

 

The a/f gauge taps into the primary O2 sensor. You can tap it into a white wire on one of the 3 connectors on the ECU. I don't remember which one though.