[strokin-7.3]

Where did you get the CPS from? A lot of people have bought the parts store CPS only to have them last a couple months. I wouldn't think it would be an ICP sensor but to unplugging it to check for oil in the pigtail takes 30 seconds so check that out. No check engine light doesn't mean no codes. Soft codes can still be thrown and you wouldn't know. Have access to a quality scanner?

 

[strokin-7.3]

Just to see if it will pull code tell them the light came on than went off and you think it might have stored a code. A 97 is OBDII so I have no clue why they're telling you it's to old to hook up. If it's because they couldn't find the connector on the drivers side, well that's because it's on the passenger side. Keep in mind though that the parts store scanner will only pull some of the codes. Before you went through the trouble of having your uncle ship his scanner to you I would probably just grab another CPS from the dealer or order one and see if that does anything for you.