The basic suggestions above are to stick to the coast and follow that around. If you find it cool temperature wise then you can go inland a bit - as soon as you feel it hot return to the coast.
I'd advise taking a gps to help navigate the cities at least.
From Port Augusta to Norsman fuel stations are few and far between .. there should be signs warning of how far it is to the next fuel stop. This section include the 'Nullabour' .. there are short tracks off to coastal views - these are worth doing to see what is there.
Shortest route is 3,420 km... 5,100km if you stick closer to the coast. That is a little too long to recommend a single route. Particularly when you don't give an indication of what you want to see.
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