I just bought one from Amazon, hoping to use it on a trip to Texas. The trip got cancelled due to DW's health. I did install it and test it out on a couple very short trips. I was very impressed. It tells 4 functions at a time. I mainly got it to watch transmission temps.because I was going to tow for the first time. It does a great job of that. I think I have it set to gas mileage, trans temp, miles traveled, and something else that I can't think of right now (lol). I would recommend it as money well spent. Easy to install and not too bad to program following the instructions.