Did you have any luck sourcing a temperature switch?

I'm in the process of doing the same. Here's a link for one alternative. I haven't tried it but it looks good, just kinda pricy ($50USD).

Baker Electronix

Still searching, thinking.

If you want something done right do it yourself two or three times!

LetsRodeo

1999 Isuzu Rodeo LS 4WD
3" CPL, 3" BL
LT265/75 16 TOYO Open Country AT
ShrockWorks Rock Sliders