MSD 89521 shift light led for 720 degree firing coil signal. Condition is “New”. Shift light designed for a specific application ,can be used on a multiple cylinder with individual coil per cylinder that fires every 720 degree of crankshaft rotation. The 720 degree can be used on single cylinder engines if coil fires every 720 degree of rotation. Check before you buy this product, designed for drag racing, quality made piece by MSD in the USA WILL NOT WORK UNLESS YOU HAVE AN MSD IGNITION *** PLEASE DO NOT BUY IF YOU DO NOT HAVE ONE as will NEVER work on your hot hatch or motorcycle – Mike