84-86938A1 – TACH HARNESS – Mercury

Mercury tach harness 84-86938A1 is an OEM wiring lead designed to connect your outboard tachometer to the engine charging system. It delivers a clean RPM signal so your gauge reads accurately at all speeds.

This harness connects directly to compatible Mercury and Mariner outboards. It links the rectifier or stator circuit to the tachometer. As a result, it ensures stable and reliable engine speed readings.

Over time, tach harness wiring can crack, corrode, or loosen. When this happens, your tachometer may jump, drop out, or stop working completely. Therefore, replacing damaged wiring restores accurate RPM feedback. Accurate readings protect your engine from over-revving and help maintain proper performance.

The 84-86938A1 Mercury tach harness uses factory-correct connectors and proper gauge wiring. Consequently, installation remains simple and secure. Because it is OEM, it matches original specifications without modification.

Shop at Arizona Outboard Dismantlers to keep your outboard running strong and ready for the water.