the sensor for my gauges were 1/8 NPT thread.
so i went to pirtek, for a few bucks you can get a t peice brass fitting, sensor in one side, oil line back in the other
nice gauges. mine have colour and sound warning, and adjustable warning settings
smoke face, blue or white led (changes with the wiring you set up, mine are white when headlights are off and blue when lights on.)
this is how they look with a decent camera, obviously in a xr6 turbo and not in my car though