Figure you've got not only the external filter, but the lines running back and forth, therefore the overall capacity is increased by more than a quart, the filter acts to trap smaller particles than the in-pan filter, the gauge allows one to monitor any heating, normal or otherwise and makes one a more
informed driver. However, anyone can argue anything........soooo, my philosophy is everybody has to do what they think is right. I just happen to agree with your very astute thought process.

Gary and Sandi WBCCI 9362 VAC and HAM
'61 Bambi
'64 Overlander
'91 F-150 w/E4OD trans with external cooler, filter and gauge
KF4BLL and KF4BLM