you can use the tach output on your ecu. look at the wiki for your year ecu. if you tap, then boost, but your AFR's go lean, or you have no power after about 3 psi, then lift off the pedal. that means the tach signal off the ecu isn't good enough. if that happens, get the 9117. its cheap anyway. ebay it

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Outside of Corona: "That sucks, peace out..." (jamie walks away)... "Sweeet, what we doin?" -Zac
Tim's garage (prior to motor install): "Im gonna smoke real quick, that way if you fuck up I am already nicotined up" -Tim