The first diagram is with a switch so that you can control whether they come on with the dome lights or not..ON lights come on with dome light..OFF lights dont come on with dome light. on the switch where it says "ign...etc"...this is where your tap from the dome light will go. Ignore the way the lights look at the top, and just know that they will be wired just like the ones at the bottom.
Attachment 6267
In this diagram it is just like the first diagram only eliminating the switch, and is by far the easiest of the two methods.
Attachment 6268
You may want to consider just tapping off of one of the dome light fuse for power to the red on the leds and then just grounding them at a common point on the chasis. You could avoid the headache of wiring the relay in there.