83 seems really low to me though?? What temp are the standard thermostats made to open? - My bottom rad pipe doesn't generally get hot untill 91/2 degs?

I've got a turbo cooler too, so would have though it to sit slightly lower on general driving?

Edit to add - don't have a defi water temp gauge - got oil pressure/temp, boost and fuel pressure - it looks like the starship enterprise without adding more gauges into the equation

Edit to add - I'll take the car for a proper drive at the weekend, as the above is only on what i've seen on a quick trip to Bluewater (so only 15 mins or so...)