Pinz Maintenance Manual - Should have come with your pinz and the first one to purchase if it didn't.
Pinz Repair Manual - If you-re going to fix it yourself or for your mechanic of choice.
Pinz Parts Manual - Nice to have on hand.
What are some other suggested reads?
I recently picked up this book and found it to be easy to read and understand. I can easily recommend it to anyone that wants to learn more about tune-ups and electrical repairs and diagnostics.
A little of what it covers:
Tune-Ups
Valve Adjustment
Compression Test
Spark Plugs
Distributor and Wires
Carburetor Fuel Injection
Electrical Parts and Tools
Battery
Lamps Wiring
Fuses Circuit Breakers
Charging System
Starting System
Tune-Up & Electrical Service: A Mini-Course for the Do-It-Yourselfer Who Wants to Learn How to Do It Right (Do-It-Right : Professional Tips and Tech)
By Michael.; Dennis Holmes Bishop
ISBN 13: 9781879110151
ISBN 10: 1879110156

So what are some other recommendations?
Miles