Use the "tach" connection in the cap as a grounding point, the one right beside the big power wire plug. It will momentarily kill the ignition to unload the gears so the OD can disengage, same as with a point-type distributor.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!