'62 Classic radio and clock

Since I don't have a 62 radio, I cannot say what the "A" is refering to, but you mention it has a inline fuse so that leads me to beleive it is the power into the radio, it is grounded by the metal dash it mounts to. If the car has no fuse panel the ignition switch would be the place to get the power, the back of the switch has a terminal with acc stamped on it, but if you cannot see up under the dash, you will need to determine which feed from the ign switch has juice in the engin run position. you can do this by turning the switch to the engine run position "not start" but the run like when you let the key off and it stays running. take a little test light and ground the aligator clip to your dash put the test probe on each terminal of the switch with it shut off. You will then know the terminal of the power in as well as determine your light and ground are working, now turn the switch to the engine run mode, you will now find 2 or 3 more terminals that will light up, use the smaller wire of one of those and you will have tunes. Be sure to remember that if you test the radio with it not mounted in the dash, you need to hook a wire from the body of the radio to the dash for ground. Also the orange wire in your dash is the one you want to tap into for the lights, you can find it mounted on the side of your speedo gauge pod with a light bulb on it. Hope that helps. SH

Thanks for the info.  Everything you said makes sense to me.  I'm going to go give it a shot and see how it works out.