Check out my LM35. These are cheap lil ICs which output a signal in millivolts (the other two wires are 5V and ground). It's calibrated such that there's a direct correspondence between millivolt and degree Celsius. Hence, a 20mV output means 20°C. That means you can monitor temps without needing an Arduino board. I saw it working post-assembly on the multimeter, with a little free-wheeling to see how temps rise. I will mount a simple panel meter on the dash to keep an eye on temps.
This route was decided upon because the KTY thermistors that the Kelly wants are not available in-town, and I needed (wanted) this now. Thus, I'm going to roll-back manually based on temperature, instead of letting the Kelly do its thing (which is actually more ideal for me since I think the Kelly roll-back settings are limited, and I don't think you can actually see the temp on the CA, so it'd be the clunky bluetooth app only, unless maybe there's a CAN-bus route). This one is rated at something like -35°C to 135°C. There's a beefier variant available, though not in-store locally.
