Finally got the bitch runnin' and we had to replace the stock o2 sensor with a Bosch 02 sensor. The problem is that once the car is started the A/F gauge does not read anything at all. If you just put the key in the on position the lights light up like they should.. any ideas what could be the prob? Tried it with 2 different gauges so we know that's not the prob.. please help! Hooked it up to the Black wire on the bosch plug.. the signal wire.. and the engine throws no code.

 

ok scratch that.. the gauge does work.. but only sometimes.. seems to be like around 5500 rpms? why would that be??