I have one for each of my cars and trucks. They are great, I can even read them without my glasses..

I just received a very nice wiring diagram from Classic Wiring. It's a complete diagram that's encased in plastic with all the correct wiring colors and seem like an excellent product for about 20 bucks delivered. About 10" X 17". Nice enough to frame.
If anyone is interested, it really answers many questions re wiring, especially about those fender mounted terminal blocks, and almost anything else re wiring.  (Classicarwiring.com)