I put one on my TR7V8 last year and I have it set to 85degC same as Mick
There are a few pics of my install here: http://myweb.tiscali.co.uk/tlweb/tr7/repmod/mod_ewp.html
I also moved the alternator to make fitting the EWPeasier: http://myweb.tiscali.co.uk/tlweb/tr7/repmod/mod_elec_alternator.html
I used the EWP controller to operate the fan after the dual speed Kenlowe Electronic controller started palying up and then failed!
Overral it works pretty well although due to the number of hose joins, mods to make the heater work and blanked off water pump getting everything water-tight took some time.
I particularly like the way it prevents heat soak by running the pump, and fan if the engine is hot.
Claims that it releases 12bhp (or whatever they claim) by not driving the water pump from the engine is, in my experience, dubious.
One thing I find a bit alarming when the engine is warming up is seeing the temp gauge oscillate between the 1/4 and 3/4 marks. This happens because the pump is turned off and on by the controller as the engine reaches the set temperature. The cooler the weather the worst it is, maybe its designed for the Oz climate!