No. For me - ignorance is bliss. As long as the temperature light doesn't come on, then I figure it's OK.
There has been much discussion under the Thermo Bob thread, related to engine and oil temperature, as to the above post I somewhat agree with , if the engine light doesn't come on , no problem, however there have been several posters that had a malfunctioning fan. There have been some people that designed a digital temperature gauge for this however they either gave up or left the forum.
Since I have a Thermo Bob and it is a one of a kind on a 2015 experimental and the supplier felt this wasn't a good idea to put out for the average Joe, and I had all the plumbing parts and gauge to do it at no cost to me, I went ahead and installed it.
It was made for snow bikes, T Bob #4, mounted on the discharge side of the cooling system, just slightly lower than the overflow tank and above the height of the rad cap---you could get a air lock if you didn't bleed it right and overheat your motor, since the high temperature sensor is dependent on water being in the engine, this would be a real possibility , Thermo -Bob would be liable, since I have dealt with closed water cooling systems in inverters for over 30 years, I didn't see this as a problem.Of prime importance to me was the warm up time and possibility of condensation remaining in the oil, as I now ride down to 1'C, the engine is happy running at between 185'F and 190'F. As vhas been posted under the T Bob thread the oil takes much longer to come up to temp.
Hope that answers your question. Also you can search temperature gauge, lots of posts on this forum!!