Hey folks

I'm trying to fit an oil pressure gauge to my 1999 Focus TDDi. Originally I was going to use the oil pressure switch point, installing a T-piece, and putting my sender there, but on researching what thread it was I got conflicting advice - some places saying M14, others saying 1/4NPT.

So, I bought myself an oil filter sandwich plate off ebay. Which posed it's own problem, it's 80mm in diameter, my oil filter is 90mm - just too big for the plate! (So much for "universal" fitment, seems to only take tiny oil filters!)

So I'm back to installing a T-piece where the oil switch currently is. As far as I know, it is the exact same oil switch as used on a blacktop Zetec, only it's screwed into the head on my diesel rather than down the back of the block.

So what thread is it?!

Cheers

-T