How to hook up A/F gauge ?

[Dreamert]

REd wire: +12V
Black: to ground
Purple: to O2 sensor ?

Is that it ?

When I hook the black to ground and hook the red to +12v nothing happens but when I hook the purple to 12v I get a reading on the gauge......

Mopar A/F gauge that is

[djgainsbond]

You need to buy a single-wire Bosch 02 sensor from a local car place..($15).. it will have threads on it like a screw. You need to find a bung, which is a female bolt looking peice that will screw down onto that sensor.. ($5)

You need to have that bung welded above your cat, then screw the 02 sensro into it ($20 labor) then you run the signal wire from the guage to that single wire on the sensor, and ground your ground wire and find a 12v for your power wire.

[Kustomatix]

where are you putting the purple wire? just doing the red/black and no purple will get you nowhere. you have to have all 3 hooked up. do you have a new 02 sensor welded above your cat?

[Dreamert]

Not yet welded but I have a bosh O2 sensor that'll hook up in the place of the one in the cat for the moment being just to light my gauge till I get my new exhaust.

[Kustomatix]

the guage doesnt light up.....

[getnpsi]

a cat skews the readings. when you do your new pipes make sure your bung is before cat, if you have one still

[srt4bryan]

yep mine is welded after the cat and its pretty much a light show

[Lagzilla]

u ahve to buy a new o2 and get a bung put in, i just went to auto zone and got a bosch o2 forgot the part number but its on the boards somewer just keep looking

[Dreamert]

Bosh: 11027