I use this app whenever one of my vehicles gets a MIL/CEL. From there I can read the code and troubleshoot the problem instead of second guessing myself and breaking something else. Came in really handy when I had lean condition on one of my cars, so that really helped in narrowing the defective part. Personally the gauges are a plus as I dont really use them but I find them also helpful. For connecting to the vehicle, I had a very cheap generic ELM wifi OBD2 that works with no problems. Overall great app, very simple, you will not be disappointed!
lobby0ne about OBD Fusion