Simmo,
Thanks for the super quick response. The connector I was referencing on my engine actually has 2 pins, and in my case is connected to the harness. If I disconnect it, the high speed circuit is activated. I am almost decided to do a DIY cool harness thing (i.e. soldering on a suitable resistor) to reduce the activation temp from 115C to 92C.
Well, that's the theory anyway. I like the button thing though
Cheers,
P.