Cusser
+1y
I also have a 1988 B2200, and a hardcopy of the service manual (bought in 1994). And I have the electronic 1992 service manual as well.
There's a little more about "our" trucks in the newer version, I'd say just use that one. There's more on the AC details, for example, in the newer one. And I think the newer one shows differences between 4-terminal and 5-terminal headlight switches.