silvertop oil pressure switch/guage

[AceSniper]

Iv got a oil pressure guage that iv been meaning to put in for awhile... anyways I pulled everything apart today (removed P/S pump) to fit it, after removing the factory on/off switch I tryed to put a oil line in... and the fitting just wouldnt go into the block, got out the calipers an its around 1mm or less bigger than the factory one. the elc sender was also slightly to big to fit....
So what im wanting to know is... what fits in there, and where do you get it from pref somthing that feeds into a oil line, or an adaptor?

Thx
Adrian

[ChaosAD]

Where are you measuring the fitting? cos the thread will most likely be tapered. Otherwise youll probably need some sort of adapter.

[AceSniper]

yup is tapered... measuring over the end... side by side they look pritty much the same... but there is a very small size dif, tryed to sand it down abit but cant make it small enough with out wrecking it