Bought a 95 gt about 6 months ago. Bought an aftermarket air/fuel gauge. According to all info I found the 95 has a 3 wire 02 sensor. The ones on my car are 4 wire. It has aftermarket X pipe on it. Could had been converted but I'm not a complete newby n I swear the elec clips look factory installed. Routing, wrappings, plugs at all ends look like original equipment. As well 95 should be obd1 so was looking at a bama 4 bank chip install. Then I noticed I have an obd2 plug in the left side center console by accelerator pedal. It is straight hard wired not a conversion cable set up. Again it looks completely factory installed. Has anyone ever come across this or has this auto had some obviously highly skilled shop do some work on this car?