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Generally, IVR would mean "Instrument Voltage Regulator", a little device that cycles the 12 Volts on and off to power dash gauges that use thermal elements to move the gauge pointers. Not what you want for ignition use. (If I'm correctly reading between the lines on your post.) The best way to do a 12 Volt conversion is to bite the bullet and get a generic 12 Volt ignition coil that specifically states "NO EXTERNAL RESISTOR REQUIRED". People use various "12 Volt converting resistors", sometimes sucessfully, but not always. In my opinion, the reason for this not always being successfull, is that various original 6 volt coils are wound differently, and therefore, some draw more amps than others. Therefore, if you use a converting resistor that might be used successfully on a certain system, it might produce too much or to little voltage at the coil in the system you are working with. Buying a universal 12 Volt coil with no external resistor required, while costing some money up-front, can avoid starting problems, or burned points later. While your at the auto parts store getting a universal 12 Volt coil, get a condensor that would be used in an application the coil would be used in. Email if you need part numbers.
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