Hey man, congrats on your purchase! Well, this is my first time helping someone out but I too recently switched out my water pump. Ok so now to your question, the thermostat that I bought was from Autozone. The thermostat that I recommend is a 160 degree thermostat as it was the one that was recommended to me. I looked all over the place for a thermostat but was only able to find a 180 degree thermostat in different auto parts store so I ended up just buying a 160 degree thermostat from Autozone and till this day, its been about 2 months, the thermostat has done its job pretty well and I recommend it! It is part number 4216 on the Autozone website it is by the brand Duralast. Regarding on the ECT sensor, yeah just get one man they're relatively inexpensive. Best of luck bro. Any questions just reply to the post.