On my 94 cobra I put in the 180 thermostat..it made a difference...especially after I had been getting on it..the lower heat keeps it running crisper..which of the three wire do I splice into to set up the manual switch for the fan?
DON'T use just a switch - they're not rated for that much current and you will melt the switch and maybe cuase a fire. Use a switch to pick up a relay that supplies power to the fan - use at least a 50 amp rated relay. Do a search on "relay" and you should get the info you need.