OBDII Plug adapter fo VMSpc

Is an adapter available so that I can use the VMSpc in my Chevy Truck? In my truck I find a rectangular OBDII plug; but the plug I use in my motorhome of course is round. Maybe I'm Google searching for the wrong thing. Can someone tell me how to mate the two together?

Thanks!

Nope, the VMSpc can only be

Nope, the VMSpc can only be used with diesel engines. Will not connect to OBDII plug.

Rex 01 Diplomat