I had to replace all bottom end bearings on my Zetec after a plastic oil pressure gauge split at the block fitting. Ironically I'd never trusted those with plastic lines, but I was holding off on replacing it till discretionary income was available. I'm now using one of those SPA oil temp/pressure combo gauges that also incorporates warning LEDs.At 5-6 bar, the sump is emptied very quickly.
For a mechanical app, do as Madmole recommends.
