MSD Ignition 8910 Factory Ignition Module Tachometer Adapter
The perfect addition to your performance ignition if you are triggering an MSD Blaster series ignition.  This factory ignition module tachometer adapter correct the operation of most voltage-triggered tachometers or fuel injection systems that do not work directly off of the tach output terminal of the MSD ignition unit.  MSD Ignition warrants its products to be free from defects in material and workmanship under normal use, if properly installed, for a period of one year from the date of purchase.