Originally Posted by AustinJake
+1 to this, but I think in addition to cutting the cover protrusion down to exactly match the stock piece (so that it holds the filter inward) you'd want to notch the protrusion so that some oil pressure could get into the pressure reading tube.
I had this in mind too - maybe leave a few mm of protusion proud, and drill holes around it.
The problem is that I think the filter comes up dead flush against the rest of the flat inside surface, leaving the hole in the middle of the cover 'sealed off', even with a notched protrustion.
Didn't think about swarf...good point. If I can drill it in such a fashion that none gets caught (hook up a vacuum next to the drill), do think the idea would still hold?