The tc version probably is a better deal because it looks like it comes with the heatsink and fan from the brushless worlds option set (82700) and it comes with 12 guage wire. I have that heat sink and fan on my normal comp so the speedo basically cost $189 whereas I could have just gotten a tc version for $169. I sure hope there's "something" about the tc version that makes it less suitable for off-road. Otherwise, you just made me realize that I wasted $20. Oh well, that's not the first time and it won't be the last.