Vacumn gauge placement

[cur.bill]

Where in my fuel setup would be the best place to position a vacumn gauge to show if I actually have a clogged filter. My idiot light goes on sometimes when the ign. key is in the wrong position. 1993 f350 twin tank using diesel and a blend in one tank.

 

[GenLightening]

Where in my fuel setup would be the best place to position a vacumn gauge to show if I actually have a clogged filter. My idiot light goes on sometimes when the ign. key is in the wrong position. 1993 f350 twin tank using diesel and a blend in one tank.

Just tee in where the stock sender is at the top of the filter head.