1st Engine startup. 2.0 Six Top End Refresh, A few questions Options

[Ericv1]

So, tonight I fire up the 2.0L six since last September and it starts within the first five seconds. I adjust the idle to about 1500 rpms (As suggested in Waynes book) and let it run for 23 minutes. After 23 minutes, I adjust the idle down and can hear a NOTICEABLE knocking sound from the top engine compartment on the right hand side. Could this be a loose intake valve? The sound dissappears as I rev the engine. Or, at least I can't hear it as I rev it.
Second, my alternator light goes out when the engine is running but remains on when the ignition is turned off with the key out of the ignition.
Third, my oil pressure light never went out. I think I can fix this one pretty easily as I may have not wired it correctly. But, I was looking for opinions. In order for the light to work, does the oil temperature sensor need to be wired up?

If you can help me with one or all of these issues I would appreciate it. I'm especially concerned about the knocking. Thanks.