Simmy;

You don't mention specifically how you have things hooked up, and one can only presume you followed the Crane instructions in installing the new ignition system components (do these include hook-up for a ballastless system, did you install a ballast resistor for the new coil?), and your reasons for making the changesin the first place...if they were installed to repair a failed ignition system, or just because you felt you had to make some "super-improvements", but I am really tempted to make some snide, and totally non-productive comments about leaving well enough alone...

1. Do the instructions supplied with the Crane system cover a tach hook-up?

2. Depending on how it is wired to the Ign Sw (what type?), the non-catching may be due to the fact that the Accessory terminal has NO power connected during cranking. Does it catch only after you release from the Start postion? (See paragraph two below)

Also, it seems that you may infact need a ballast resistor with the new coil...in which case you may also need a new Ign Sw.

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Good info about Ballast resistors I recently came across at: http://www.imperialclub.com/Repair/Electrical/coil.htm

Purpose of Ballast Resistors from Brooks:
When the engine is running, you can get by fine with a lot less current at the points. That's the purpose of the ballast resistor. If the points were to receive full battery current/voltage at all times, they would only last a few hundred miles before needing replacement.

At the time of cranking (when the starter is operating), a separate wire gives the points the full 12 volts, bypassing the ballast resistor. When you release the key from "start" to "on", all the power to the points now has to flow thru the ballast resistor, preserving the points.

...more questions than answers! Cheers