I've elected to go with the Canton thermostat which opens at 210 degrees since the
oil needs to be hot enough to outgas the junk that mixes with it.
There are several threads in the recent past about
oil temps and thermostats that a search should turn up.
The Canton unit is expensive (about $170 list minus a Club Cobra discount if you mention it) but it's a pretty impressive looking unit if nothing else.
DonC