Auto Meter Tach Adapter 

Auto Meter Tach Adapter

This Tach adapter will allow you to connect a tachometer, shift light or RPM activated switch to a distributorless ignition system (Including 1999 and newer Ford Mustangs). This adapter senses the current from the positive coil source wire and converts it into a 12-volt square wave signal that can be read by Auto Meter Tachs and accessories. Compact and completely potted in polyurethane for vibration and moisture protection.