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![Regitar USA Knock Sensor f/Mercruiser Inboard Engines: MCM V-6 V-8 (305, 350 496 CID) MPI Engines w/ECM 555 [RMH001]](http://marineandrvsupply.com/cdn/shop/files/107532XL.jpg?v=1742344529&width=1445)
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![Regitar USA Knock Sensor f/Mercruiser Inboard Engines: MCM V-6 V-8 (305, 350 496 CID) MPI Engines w/ECM 555 [RMH001]](http://marineandrvsupply.com/cdn/shop/files/107532CXL.jpg?v=1742344532&width=1445)