Outer Limits 4x4 Board

I am in the process of starting a new project and am asking for help regarding engine operating temps for the old SD33T.

The plan is to reuse the thermos i have out of an AU falcon but this time running them automatically with a temp switch and have a manual overide.

So, what im looking for is opinions on what the temp range the thermos should be on-off at. Mainly for touring and highway towing boat and it also needs to run a couple of heat exchangers to heat up the fuel ( WVO) . i plan to install a larger radiator as well shortly

im acutally after the same answer but for a td42 with a 91 degree thermostat. Working out which temp thermo switch to get.

Il be running mine on a 3 way switch thermo,off,constant

i bought a davis craig one and it has a range of 65 deg to 105 deg so i just turned it off and went for a strap on the highway and found that the car sits on 90 deg so i bumped it up so at 92 deg the fan comes on.
this was done on a hot day in summer

i dont want to run a davis type. I want to run a proper sender mounted in the thermostat housing.

Thanks for the info though