I installed a W/T sending unit the same place Dan speaks of a year ago. Depending on how anal you are
you dont need to remove anything. I used 2 cordless drills for the job (1 with the proper size bit, 1 with the tap) didnt even remove the radiator cap lost maybe 2 oz of coolant. Once you have everything together less then 1 minute to install the sensor. Drill, tap, and screw the sensor in = done.