Another option for the oil pressure sender is to put a "T" fitting where the idiot light switch goes, then you can mount both the switch and the sender down by the oil filter.
As for the temp sender you can drill and tap the boss on the intake, or replace the intake with a later stock or aftermarket model that has the hole already.
Another option on later engines is to mount it on one of the holes on the side of the heads just below the valve covers. But I don't think the heads received those holes until the early 1970's.