Stolen from gp336 on eBay.
http://myworld.ebay.com/ebaymotors/gp336/
The red one is a VERY old edition, perfect for '80-86 trucks. It includes many older diagrams not found in later editions. For '87-96 trucks, a red cover that goes to '96, or an early blue cover (as shown) would be much better because they contain much more info about EFIs, including superior wiring diagrams.
Unfortunately, the latest blue-cover edition has deleted much of this info, and isn't worth using as toilet paper.
