1986 300SDL WVO oil filter

Has anyone developed a way to predict that your FM100 (or other WVO filter) is getting clogged? i have found that i don't have much warning when it is starting to affect the performance of my car. If i didn't have the option of switching to my second tank (diesel fuel) it might really get in trouble some time on a longer trip.
Is there a way to do it with a pressure gauge prior to the filter.....?

Interested in you comments.

Scott

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