i ended up using a hex on the square plug but wouldnt recommend it...i got it out without stripping it though so i dunno...fwiw those a/f gauges are dummy gauges really and i wouldnt recommend it...Personally i would go ahead and spend the few extra bucks for the dynojet wideband commander it comes with a gauge for ya and everything you need to hook it up including the sensor and at least youd have a wideband to actually keep track of whats going on instead of the stock narrowbands but thats me. Also fwiw hptuners offers a license for your perticular vehicle so tuning is available if you want to toy with that
