One thing worth thinking about with these is that the thermostat is mounted in a lightweight rubber ring and a circlip, if the thermostat gets to over about 8 years old without being changed along with the new rubber seal the seal often breaks and goes AWOL... This allows coolant to get past the thermostat and bypass it, often meaning the car never gets up to temp.
A 944 oval dash should run a bit over the one third mark on the guage, a square dash should run at the half way point.
With both an oval and square dash the fan or fans should come on at between the half way point and the two thirds mark.
Interestingly aftermarket thermostats sold by places like Porscheshop, EuroCarParts and Design911, unless made by the correct OEM manufacturer (Walter or Walther from memory) run cooler, to the point on an oval dash of often running on or just under the one third mark, which tends to make the car not only run colder but burn more fuel.
The genuine/propper OEM thermostat is also a much more heavily engineered item than the aftermarket ones often sold as OEM.
I would only fit the proper OEM or genuine one, it is such a pain to get to and change, it is not worth saving a couple of pounds on buying the cheaper alternative.
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and I do approx 30 mph for 2 miles and 40-50 thereafter.