For the oil temperature sender... You should be so lucky!
The usual way is to get an aftermarket sender that screws into the sump, in place of the sump plug.
are these to drive aftermarket gauges, or standard ones?
Id personally lean towards getting a set of guages off a better model, and wiring those in - in a lot of cases the wiring is already there and its a straight swap as far as rev counters are concerned, and looks a lot better than having a couple of pods sitting on the dash.
My Mk1 R5 received a set of clocks from a Gordini, and the rev counter worked straight off!