Dion, technically it would be the cam that gets the sloppy reading since the crank sensor reads off the crank mounted flex or fly and the cam sensor reads off the distributor via cam via timing set.
More than just an issue with the location of the manufacturing plant. The MSD stuff (last I looked) is a flying magnet style and gives a different type of reading than the OEM Hall Effect pickup. Plus it only has 4 magnets, as opposed to the 8 notches in the OEM setup. Far as I know, there is no off the shelf aftermarket crank sensor that uses a Hall Effect pickup, but I haven't looked in a while.
Knowing my track record, a custom crank pickup will end of costing me more than a flywheel, and I wont figure it out until I've spent too much money. Some guys never learn. :BangHead::realcrazy: