This is what our Pinnacle's station looks like (not sure of the Eagle) and is located on the off door side.
You see there are 2 grey water handles with the middle handle for the bathroom sink/shower and the right handle for the kitchen. The location of the handles makes sense...the middle for the forward tank and the right handle for the rear.
As far as looking at gauges for quantity fill forget it...they don't give accurate readings. We are just in the habit of dumping the kitchen tank every 3-4 days (or as needed) and the sink/shower grey and blank tank about once a week or longer.
We are out for months at a time and found this works best for us.