Thanks for all the replys guys.
I have contacted Jon at PE to ask if they do a compensator for the 230F gauge.
Marlin are you saying replace the stock WP pulley with the OD unit from someone like Ipsco. I have the Flowcooler water pump fitted and there was a new core fitted in the rad last year.
I have bled the coolant system several times as you describe, doubt there is any air in the system now though I am going to give the vacuum system a try now I have bought it.
No the system is not overheating but I would prefer all the gauges including the temp to give accurate readings.
Horace