Crank Trigger Ignition for Single Cylinder Engines. Kit includes magnet ring, bracket and module. Easy hook up. Buyer must specify diameter of PTO end of crank at the block. MWSC steel crank requires a 1.5” magnet ring. This crank trigger set up will allow you to use our Equus Tachometer on your 1 cylinder. This ignition module has been tested on our 1cylinder engines for the past few years. Fits kohler and MWSC aftermarker blocks. Must be used with 3 ohm coil. Bosch coil is 3 ohm found on bottom of this page.