If you own the car long enough and as it ages you may well find that manual an important item in your set of tools! I refer to mine, or the on-line manual available only to ERA owners, more often than I'd like to!
Most recent example (last week), my fuel gauge suddenly stopped working! I tracked down the wiring details and ran some tests. In the end, I had to pull the dash (bummer) and found a broken power wire. Drat...
I think I broke the wire when I recently installed the new heater, which sits right behind the fuel gauge (I'm mine own worst enemy).