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+1 for the LC-1. Works great with my Megasquirt. Only have done one free-air calibration in 5+ years, just to double check that it was accurate. So far it's dead on.

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I havn`t calibrated mine in a couple years but maybe it`s time although I figured w/a 3 1/2 side exit that was "airy" enuff............ Mine`s older and even has a countdown warm up deal.