On Ducatis, the computer uses the engine coolant temperature sensor to supply additional fuel while the engine is warming up. Engines need more fuel when for a cold start as there is no heat in the ports and chambers to keep the fuel atomized as vapor, so it condenses. Fuel as a liquid burns very badly in the combustion chamber, so throwing more at it ensures enough stays as vapor for some sort of combustion. Injected engines get a very nice fuel spray from the injectors and this is why injected engines behave better when cold.I guess 150 is OK. Runs fine. I wonder what the computer thinks.
I replaced mine last summer.If either of you have the OEM temp senders, I would highly recommend Bosch or NAPA replacements. Both senders on my ST2 went loopy years back. It's one of the first "upgrades" that I did to my newer ST4s.
Basically, they were so far skewed, that by the fan turned on, the engine was overheating (boiling the coolant that was under pressure!).
You could verify with an optical pyrometer (point it at the area where the sender is).