Yeah, the price is a bit high. Im pretty sure i can go to summit and pick one up for 60 bux. Not to nock ya or anything. Its in good shape, but i dont think people would be interested in an air fuel ratio gauge at that price. try lowering your starting bid, and maybe it will make its way back up to 50.
The a/f gauge moniters the exaust temprature by the use of an o2 sensor to show you how rich or lean your engine is running.