ok i have a 94 GTP and i want to put an air to fuel ratio guage in it does anyone know howto do this or have any of you dont this before?? any infor helps !

thanks

Well, the ECU(a.k.a PCM) is the one that controls the mixture ration. THe only way to get what you want(to my humble understanding) is getting the reading from the PCM directly. I do not know how this is done, but is the only sensible way because if not then you should have to install a sensor on piston 1 and this sensor will read the gas and air relative quantities at the piston and then give you a reading.(This is not really easy to do, the PCM reading is the same and safer). I do not have the deatails how is it done from the PCM tought :(

ok i was told that i hook the green wire up to the 02 sensor and there is a black wire 2 white ones and a gray one. But which one is the signal wire???

I do not know. I have the shop manuals for the 98 Pontiac. Mayve if you send a private message to The Burning Rom or Ripn12s they might have the information that you are looking for.