trans temp is the only one i can think of at the moment that would be useful. and thats only if you have an auto and tow a lot.
2003 Rubicon, 4.0L, 5SPD, Custom 4.75" lift, 33" MT Baja Claws
1999 SE, 2.5L, 5SPD, sold it
PM me for wheeling in and around Northern Illinois