Truck interface question

I am trying to interface to a truck's in-vehicle network using a legacy
computer.
I know nothing about in-vehicle network standards.

We bought a Dearborn Group DPA III/i to communicate via a serial line.

But I think I bought the wrong standards document (SAE j1939-71) and
I am trying to be absolutely sure that I buy the right one this time.

The truck is a 2000 Sterling L7500. According to Dearborn, the DPA is
indicating the J1708 protocol when connected to the truck. But I
think that
J1708 is the physical layer. I need a document that specifies the data
layer.
I have been advised that the correct standards document might be J1587.
I am not sure how to confirm that. I have not found a technical
assistance
line a Sterling where I can confirm that this specific model or VIN
uses
J1587.

If anyone could provide the MID and PID for RPM or something every
truck should report, then I could try it.

.

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