I have no idea what wire on the ecu i need to hook my a/f guage up to. I know its purple to white but which one???

 

there is no way you could've searched and not found the answer, there are dozens of threads that contain 'ecu pinouts'......

 

its a solid white one. i think there are 2 to chose from so pick teh right one

 

if your hookin up that guage just splice into the wire harness on hte o2 sensor. its a white wire but use the sensor on the o2 sensor on the manifold/header what ever the case may be.

 

on the ecu splice into the white wire on the third ecm/pcm connector to the right. it's going to be the one in the middle of that connector and make sure it's the thick dirty whiteish looking one beucase the other one is just a ground.

 

does the 00 si have wideband? cuz if not im selling the a/f gauge from what iv hurd

 

no it dosent have a wideband, if you want a cheap wideband look at AEM's UEGO setup

 

the guage is pretty useless without a wideband