Download the RAVE tech manual set in link below.
Temp gauge is really not very accuarte, it is more like an idiot light with a pointer. At 9:00 position it will actually be a wide range of temps. When it starts crawling above 9:00, it is already a lot hotter than you would want it to be. If you have access to a data reading scanner worth a look at coolant temp.
Oil PSI warning light is 7 PSI, so you can drive around at 9 PSI and not know it. Check fluids weekly, without fail. Consider aftermarket gauges, like Glowshift.
Many posters use a diesel rated oil for extra cleaning of gunk left behind by previous owner. One choice is Shell Rotella. 5000 miles on drain interval, syn or regular. It is a 1960's engine design, not a Toyota.
Look in our forum's tech area, where there is a write up on propshaft rebuild. If your shafts have zerks, grease every oil change, if not, rebuild, they make a chirp noise, just before coming apart and kncking a hole in the transmission...
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