Mercury - Quad Engine LCM Zero Effort Kit Legacy Control Module 84-8M0169311. OverviewThis kit lets older quad-engine Zero Effort Controls run on the newer Digital Throttle and Shift harnessing without rebuilding the whole helm. It keeps the controls feeling the way you're used to, but the system behaves more predictably once it's tied into modern wiring. With four modules and the harness included, the rigging stays cleaner instead of turning into a pile of mismatched cables. It's a straightforw