I looked in the archives and found a similar post to this and everyone seemed to think it was a O2 sensor problem, but mine symptoms seem a bit different. Alright, yesterday, Sat. 3-9-02 I went to a track to test my car to see how fast I was. My car was running perfectly all up until last night. When I woke up this morning and drove to work I noticed my A/F guage wasn't registering at all. My car idles normally at 800-900 RPM's, but the A/F guage shows NOTHING. I have a bar graph A/F guage and it doesn't even register to the leanest part of the guage. When I boost, the vacuum jumps like normal until it gets to about 10 pounds of vacuum and then it hesitates and rises very slowly. My car still boosts fine, but it feels weird when getting there. Also, the car's performance seems a little choppy at times. I tried messing with the fuel pressure regulator and it didn't seem to do anything for the car. Anyone have any clue as to what might be wrong? The car is still drivable, but I'm really afraid to push it at all (and I will not until this is cleared up). Thanks for your input.

Oh, and I'm not getting any engine codes except for a 12 which is disconnecting the ECU within the last 50 key-on cycles....

And yes I have gas and oil. There also isn't any visible smoke that I can see when revving the engine.

How did you wire up your a/f guage? If you tapped into your existing o2 sensor you might have fuct your guage up. You also might have messed up the output from you stock o2 sensor in turn sendind wrong readings to your ecu The proper way to install this guage is to get an independent o2 sensor(single wire), with a weld in bung. That way all your stock stuff stays that way. I think a 3 wire sensor means that it is a preheated sensor witch means it has voltage going to it. Now when you put all these wires together You have a risk of putting voltage where it shouldnt be. Late mike

I have no clue how my guage was put in as it was done by a shop here in town, but it still doesn't make sense if it was wired incorrectly that it would just all of a sudden start. I've had my turbokit for about 3 months now and only run 5 psi of boost.