The lead to the switch may have roasted (it is behind the exhaust manifold and can touch if things are too floppy) and grounded out.
By all means check the oil pressure first. It is hard to get the switch out where it is but pulling the rocker cover is easy and oil pressure will cause oil to squirt out around the rockers at the shaft.
It did or did not start? Pump shaft may have broken OR dizzy came loose and allowed drive gear to pull up our of the pump (and then the dizzy climbed out of the gear so no run). Easy to check!
Pull cap off dizzy and see if you can turn it by hand (shouldn't be able to but wiggle it). If not, turn engine over and see if it turns.
No turning when cranking is certain sign of further issues and time to pull dizzy for a look.
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Mike!
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