I believe the coolant temp sender is 5/8 UNF threading. I couldn't find an adapter at the time, so I ended up getting a plug and then drilling/tapping it in my lathe.
Mike, definitely post up the oil sender threads when you figure them out, I'll be doing that gauge next.
My oil line fix
My 100k stopped odometer fix
Brace for impact, I'm in a "modifying mood". Massive thread count inbound.