Separate control for fan could be useful. I recall seeing an adjustable control to be used for the fan utilizing a separate radiator sensor. Jegs or summit racing i believe.

 

Yeah the dexjs youtube channel has a decent video on one of those. It was Hayden product. Part 3653. I thought about it. But I'm just gonna do the switch route.

 

I'm late to this thread, but I also run a 180F tstat. I installed the Flex-a-lite 31163 PWM fan controller and control it using a standalone temperature sensor in the hose going to the heater core. I think its possible to use the factory temp sensor as well, but liked the idea of using a standalone sensor.

The hassle with using a sensor in the heater core flow is finding an adapter. Hesco has an adapter, but its for 5/8" hose, and the incoming heater core hose is 3/4" hose. I ended up purchasing a Glowshift 3/4" adapter which comes tapped for 1/8" NPT fittings. The Flex-a-lite sensor is 1/4" NPT, so I had to drill and tap the Glowshift for 1/4" NPT. I think its possible to cobble up an adapter using brass fittings, but it would have been big and heavy.

The other trick is interfacing with the factory efan plug. Any of these are compatible with it: Standard Motor Products S-2052 or Duralast 1079 or WVE by NTK 1P171.

I mounted the controller to the cowl area. The sensor is wrapped in insulation to limit the effect of engine compartment air temperature on the sensor reading.