Variants and Accessories for the Advent Diesel Engine Tachometer   Diesel Tachometer Kit (A2106) Injector Pipe Transducer - 4.55mm Injector Pipe Transducer - 6.00mm (Most frequent type) Injector Pipe Transducer - 6.35mm (¼") Injector Pipe Transducer - 8mm Injector Pipe Transducer - 7mm Pack x4 AAA Batteries Replacement Carrycase