Replaced the wire originally used for the ground and the longer run, with 12 gauge wire. I installed a 10 amp fuse for now. The fan works, so when I go to the track in a couple weeks, it’ll be interesting to see what temps I get.
Edit: The oil cooler itself isn’t that big, because I did not want to block too much air flow to the radiator. Hopefully, it’s doing something with the fan attached now.
Edit 2: Hopefully this weekend, I can install the thermostat to the oil cooler.