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That is correct! 89-90 FSM changed the side for calibration from the flat 3 pin side to the square 4 pin side. 87-88 FSM said to do the flat three pin side. But once you do the calibration on the square four pin side be sure to check the 3 pin side at idle and at WOT. Either side of the TPS can be bad, so you really need to test both sides, but calibration on the square, TCU side works best. I posted test data for idle and WOT on both sides of the TPS somehwere in the "RenX files" thread.