Cheers for getting back to me so quick MB.
What you have recommended sounds very similar to what I have been viewing when looking at them tube vids about the 6.5 how to manage heat issues.
Yes, we already running the upgraded 130 GPM pump and fan assembly that comes with the donk set up from Brunswick .
but this looks the goods when that one wears out.... new super bling pump just out this month
https://www.youtube.com/watch?v=Lap36DcNhC4
also found this interesting as well
https://www.youtube.com/watch?v=VuNnDXY62vc
Using a restriction to divert more coolant to the radiator ...but not near that point yet, as this is just a temperamental type glitch.
So I will look at the 88C AcDelco TS’s (but need to chat with Brunswick to see what they fitted) and yes, A/M temp gauge is on the list (so thanks for validating that)
Cheers