I have a 4 into 1 header on my car so the OX sensor is placed at where the collector for the 4 pipes. You can find the ox senor gauge at Summit Racing (I think their on line also) or Racer Wholesale WWW.racerwholesale.com Pelican maybe? I run the K&N Surface mounted unit (it fits inside the side vent on the drivers side.) Everybody calls them “Fuel –Air Ratio Monitors.” The theoretical ideal mixture is 14.7:1 they have either lights or LEDs that move based on what the OX Sensor is telling the gauge.
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