Previously I used an old Maverick. I was able to run the wire for the probe through the knurl that the spit rode on and used some Velcro to strap the sending unit to the handle of of the spit. That allowed the sending unit to rotate and keep the wire for the probe from getting bound up. That worked great for a couple of years but at some point the batteries leaked in the sending unit and I had to toss it.
Now I do the "lift the lid and test" method, but I don't use the rotisserie that often anymore. I guess if I started using it more, I'd start looking for a used Mav . . .
BD