Ahh seizure - not a good outcome. I seem to remember - but have not looked back - that there was no certainty about the correct / upper running temperature, and also no certainty that the temp guage was reading correctly.
What I am saying is not ignore it, but why was the meter fitted in the first place, because it was available or because there was a charging issue and the cause was being sought. In either case it is good to know that your metering is accurate, or there is a correction factor that can be put in. - I have two digital thermometers in the house and they read 1 degree different when stood together, I could always deduct .5 from each, or find out if one is correct (within reason) and then add / deduct from the other. As it I am not that bothered, I am happy with a general point to when it is close to freezing at night - so I can forget and then look at all the frosted off tender plants in the morning.... :-)
Though I guess the worst thaat can happen here is that the alternator cooks itself, the reg/rec and the battery - costly but not terminal.
I just remember taking the alternator on and off the Triton too many times, wiring and rewiring the reg and diodes, remounting the diodes here and there. Buying stealing replacements etc etc before I questioned whether the brand new meter was reading accurately. It was not and I had spent time effort and money chasing down an electrical fault that did not exist. We had a similar problem in a factory once where the usless turner (me) could not turn out items to spec. After much beating up of the turner, checking of his instruments, maint pulling the lathe apart etc, we found out that the inspectors guage had been dropped and was damaged. But this was the last place looked as it was the 'assured' item... ooops
Hope cleaning up after the seize was not too costly and all is running well now.
R