Note that the 6 pin connector was not available until 1995. A 1992 Peterbilt would require a hard-wire install, but most likely would not supply RPM and speed data. The truck really needs to be 1995 or newer for the HD 100 to work as an EOBR on that truck.
For older trucks that are 1995 or newer, we can provide a 6-pin J1708 cable (plug & play install) or do a hard-wire install. The HD 100 supports both the J1708 and J1939 protocols.
You can purchase additional cable and mount options by visiting randmcnally.com/fleetaccessories.
If you have questions about alternative cables or install options, contact Rand McNally Customer Support at 1-877-446-4863 or HD100support@randmcnally.com.