Ron, I think you will find using vacuum gauges that you will change fuel filters less often. I did change filters on a regular schedule, but now change far less often. My gauges have a "following" needle that stays at the highest point registered. They are super great to have.
Here are the gauges I have. Home
If you like them, contact Capt Tim there. He also owns Florida Marine Diesel Service, and services my boat. No affliation, but if Tim does it, it will be right.