This app has served me well everyday. I did an engine conversion in my 1984 Vanagon to a Ford Zyrtec engine. I use this app on my phone as a dashboard for all critical engine metrics. My van essentially only had idiot lights, this app provides me we with a visual means to see all the OBD data real time on my dash. Very easy to use, easy to see history and connection is automatic as I keep a wifi plug on the ECU at all times.