Now you can use your Windows-based PC tablet or notebook to monitor your engine - with the VMSpc. VMSpc is an intelligent data translator that links between your USB port and engine diagnostic connector on your rig. Together with the special software, it allows you to read performance and diagnostic information right on your laptop computer. You get complete real-time performance gauges, diagnostics, trip information and graphing system that lets you display any number of parameters at once. You can even store the engine data to a file and load it into a spreadsheet.


  • Check out the VMSpc 'Best-Of' Gallery of Installations.

  • But wait! There's more! VMSpc let's you program audible alarms based on any engine parameter. For example, you can set it to play any MP3 or WAV file (grab a microphone and record your own!) when your road speed reaches a certain point. Have it played once, once a minute, or continuously.

    And you can create a "Tank Minder", which provides a miles-to-empty calculation based on your tank size and fuel economy. VMSpc lets you enter correction factors to compensate for a poorly calibrated engine/ drivetrain. You can even program gauges to read in metric, if you desire.

    Professional engineers use VMSpc to test their vehicle designs. Now you can use the same tools to test your coach.

    Feel free to download the VMSpc software - it's free. In fact, SilverLeaf Electronics is committed to provide the VMSpc software and all updates absolutely free on our web site. We welcome your input and encourage you to tell us what you'd like to see in future versions of VMSpc.

    System Requirements

    -Windows - Any version except 'RT'
    -Pentium 120 or better CPU (Thats any CPU made since 1997)
    -16 MB RAM, 20MB+ available on the Hard Drive

    Available USB Port
    ### This is a product for Windows-Based computers aka "PCs" ###
    It is not Apple tablet compatible.
    It may be used via Fusion, VMware on your Apple notebook however.

    VMSpc Kit, $395 + freight
    VMSpc JIB (JS501/USB or JS550/WiFi)
    6 ft USB cable (as required)
    5 ft engine diagnostic harness (specify 6 pin or 9 pin)
    CD with software
    Owner's Manual


    New! Wireless Versions for J1939, also $395

    If you have a J1939-equipped engine, you may be able to connect with USB or Wifi. Our new for 2015 WiFi module has been redesigned--now connects quickly to all Windows platforms. You can recognize a J1939 engine by the fact that it will use the black 9-pin connector, and the engine is 2004 or newer. (A few older engines also use J1939. Call for more information.) The older, 6-pin connector, is based on the J1708 can-bus and uses the USB style of Silverleaf "Jib."

    The WiFi jib has plenty of range, no matter the size of your RV. The USB model can often be set up to also charge your tablet while underway.

    If you would like to try the software for yourself, go to our downloads section and download it free of charge! VMSpc Download