912ULS Vs. 912iS Warm Up Time

PJ Wrote:
"What model oil and coolant thermostats do you use?"

My situation won't help.  My Kit Manufacturer supplied them.
The Oil Tstat looks very similar to the units offer by AC Spruce. 

The Coolant Tstat is definetly a custom unit.

Search for "Inline Thermostats" commonly used in the Race Car/Motorcycle  World.
A "Thermo-Bob #1" will fit 1"hoses on the 912 engines. 
I have no experience with them.  Your decision!