We have a variety of "Temp Stickers" that are great for monitoring temperature of everything from your gear box, differential, to the driveshaft and brake calipers.
"A" = 98F - 149F
"B" = 159F - 230F
"C" = 240F - 309F
"D" = 320F - 390F
"E" = 399F - 500F
Packs of 10.