Trying to read '99 to '02 ford diesel

[Bruce.b.scoville]

I'm using the ODB-II with an arduino Mega. My code works reading my 2005 Camry and my son's 2008 ford F250 diesel (6.4l).
My Problem: I cannot connect with 1999, 2000, 2001 ford F250 diesels. My son has a laptop software with ford options which reads the older for F250 diesels in depth. Al I need to extract is SPEED.

Has this been done with OBD-II interface? Any suggestions?

Thank you in advance for your help!

Bruce

[stanley]

Not much chance for pre-2006 cars.