I think it's the extra fuel milage and power that puts them off? The smoother idle as well perhaps? Might be the 10.00 or so cost of the fluid filled gauge holding them back. Or the effort to install it.

Also the unproven potential cause of the number one rod failure should not be ignored. .Even if this is thought just an outside chance . I think it almost compulsory to check pressure on the four cylinder 616 engines because of that issue.

By now at their age a percentage of lift pumps are defficent as well in pressure output. The system has just gotten old and tired. Yet cheap to restore as well if it is low pressure wise. More likely it is a diesel and if it runs it must be fine.

Seriously though I too find it strange more people have not checked the fuel supply area out better. Although quite a few have already. Just not mainstream yet. Those that go to 19 pounds are more than happy from their feedback every time.

When I say check it out I mean setting diesel fuelled examples to 19 pounds. There are no issues curently or in the future I feel at that pressure.

If you send your injection pump out for a rebuild it will come back set at nineteen pounds by many shops. So even if overall calibration was close enough when it went in it will still seem better.