Mercury - Tune-Up Kit Ignition System Component Delco Conventional Ignition 34235T1. Overview. A smooth-running engine starts with a strong spark, and the Mercury Marine 34235T1 Tune-Up Kit gives your ignition system everything it needs to perform at its best. Designed for Marinized 4- and 6-cylinder MerCruiser engines built by General Motors with Delco conventional ignition systems, this OEM kit includes a new condenser, points, and rotor - the key components that keep your ignition firing clea