This is a little tester I built some years ago & thaught might be of interest to Electronicly minded mechanics. It doesnt use many parts, Q1 is salvaged from a vehicle ECU that had 3 Ign coil switching transistors with in built damping. If these are not avalable you could use MJH10012 darlington with 3 x 75V 3W zenners from the collector to emmiter. There is also a lead fitted from the base of the driver transistor to drive things such as electronic speedos or some electronic driven IGN modules. In the pics it is shown driving various Ign coils & an Injector. The CDI ign module is from a brush cutter. To drive these you need a Ecore, The one i used is from a very old transistorised car radio, it was an audio O/P stage. Also handy for finding where there is a breakdown of insulation on IGN leads. The type that is deep in the cylinder head. In the pic there is a spark plug in the end of the lead with a very wide gap. You then use a grounded lead run over the insulating boot, the spark will jump through the breakdown point.
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