foget onboard temp gauges, if they work they re only variably correct anyways. for temps get a handheld temp gun. i use the duratrax hand held temp gun. works well and is pretty acurate. displays in F or C as well, and is adjustable.

i have a Spektrum, but upgrading from that to the Nomadio Senor, or the new to be released in mid October, React.
For aftermarket Failsafes. i recomment the Mtronics unit. very small, extremely light, easyily programmed and not only will set the attatched servo at your choosen failsafe position, but also can be programmed for low battery failsafe set ups on 4 and 5 cell rx battery. BONUS. i think i paid some silly price of 15.00 each. great value for the unit. i have 5, use 2 so far, no issues in 4 months.

Timmahh