Very small update here...
I decided I had left my headlights on too many times.
I saw on this site that a headlight warning buzzer was cheap and easy to do, so I did it.
I found this pic from a factory service manual on another thread.
I picked up a buzzer from radio shack for $1.19 on clearance. Then added small ring terminals for plugging in to the fuse box terminals.
Added double sided tape.
And installed.
It works good. It's a little quieter than the key on buzzer, which is good.
In case you don't know how it works, the headlights feed gives it power and the ignition gives it ground through various circuits when the key is off.
So, key off + headlights on = BUZZ.