I'm intending to use the unit on a Caterpillar engine model C12, however, the Deutsch connector on the CAT is a little different not the standard female HD16-9-1939S used by VMSpc: no key on the center pin (is round) and it's wired on a, b, d and e. VMSpc connector (HD17-9-1939S) is wired on pins a, b, e, f. Any sugestion? Francisco