Yes, I know, its a rather strange thread title. While I wait for CNC parts to arrive for my Opposed Piston engine, I am thinking of my collection of i.c. engines. I now have the Webster, the Kerzel hit and miss, the Atkinson engine, the Odds and Ends engine by Philip Duclos, the "Rupnow engine" and the newest, my opposed piston engine. On all except for the Rupnow engine, which I used a CDI ignition, the rest of the engines use conventional 12 volt coil and ignition points. The Kerzel engine is in a category of its own because the 12 volt coil is built into the engine base. This still leaves me with four engines which require that every time I want to run them require a complete wiring up before they are runnable. They all have their own point set and condenser, but the coil has to be changed from engine to engine. Coils are not cheap. I pay $50 each for 12 volt coils at my local auto parts store. Fortunately I have a deep cycle 12 volt battery for my fishing boat, which is a ready (if heavy) power supply. I think I may embark on a small woodworking project.-Basically a small wooden box which will hold a 12 volt coil, an on/off switch, an indicator light to show when the power is on, and a permanently installed high tension lead from the coil. I may make the "power in" lead and the ground lead "plug in" style connectors with alligator clips on the ends which attach to the battery and the ignition points. I may even make it a dual compartment box so that all of the electrical leads can be coiled and stored in the second compartment, so that my "power box" doesn't have a gaggle of wires hanging from it. Has anybody else done something similar?---Brian