After bitching about a dead Trail Tech temp sensor to Jbot he reminded me of this and I finally did it myself. Maybe more people haven't done it because they dont realize how simple this really is. You solder in the 2 wires and its done.
Buy this at Harbor Freight, its less than $6.
On the right side there is a little relief to slip a screwdriver in and pop open the case.
Clip those wires, pull out the probe, and solder in the connector from your old, dead, piece of shit, non replaceable battery, son of a bitch trail tech.
It was reading erratic with a resistor cap and regular plug, so I tried a resistor plug with a non-resistor cap, and it works great. Odd little detail but thats what works.
That's really it. Its that simple. (edited)