Sorry the thread Jack but what is the advantage of a crank trigger over a standard msd billet dizzy?
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Think of it this way.
The conventional distributor is driven from the camshaft which is driven by a chain and sprockets, belt and pulleys or gears, and then ultimately to another worm gear. The opportunity for inaccuracies are pretty strong.
The crank trigger is signaled right off the crank. No potential for slop and way fewer moving parts. Don't have to worry about distorting components either (cam twist etc.)
An even larger advantage is that you can literally see the timing changes in increments of a half of a degree, even less if you really want to split hairs.