RPM / Tacho Correction Module for GQ Patrol - suits M57 engine swaps!!! *FREE Untracked Postage !!! This is a tacho correction module for GQ and some GU patrols. We have this unit in our BMW M57N2 converted GQ patrol. Blue signal input (for M57 connect to pin 53 on the ECU) White signal output (connects to the tacho sense wire on the instrument cluster) Black ground Green positive *NOTE: If you require tracking or express postage please select this option at checkout. The Free postage option will be sent without
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