need info on o2 sensor

[mixeds14]

im installing a t25 setup on my ka n was wondering if i could use the factory o2 on the exhaust elbow(it has a hole for something) n also will this work with my air/fuel gauge, im new to this site n slowly learning about this turbo stuff thanks

[WDRacing]

yes and yes

[mannie111]

what's the o2 sensor for? is it necessary? if i get an hks hi power exhaust will i have to get a special o2 sensor for it?

[Chaluska]

O2 sensor detects the amount of air/fuel in the exhaust..

there are a few different kinds

1 wire (signal only) compares whats in the exhaust stream, to whats in the atmospheric air around the sensor.

3/4/5 wire Heated sensor, where there is 2 grounds, a signal, and a +. the ecu sends a signal to heat the o2 sensor for better readings..

But on the good ol KA, the 1 wire front O2 sensor is all you need.