I know a lot of you folks utilize a ScanGuage to monitor all engine functions and if you do not you should...unit gives you everything you can think of from MPG, averages everything, clears any codes that might come up, etc. I have the unit (and two book instructions) that is calibrated for the E-450; I thought I could use it on my new diesel coach but of course the ports and units are completely different! I made a bracket that slides into the coin holder on the dash and with Velcro the unit sits perfectly right in front of your eyes and looks OEM. if anyone is interested please message me with a solid offer. Thanks, Ron G.