Oil pressure line adapter

[Black95TSIawd]

I have a 90 oil filter housing and would like to use the open port that faces forward to feed oil to my oil pressure gauge. However, I have no clue what the size/pitch of the threads are. I do know that my fitting fits right into where the dummy light sending unit does and I could use it there, but I'd like to have both operational.

Attached are pictures of what I'm talking about. Does anyone know what adapter I would need? I've called a few shops, but they need me to be specific with the sizes.

 

[blazebolt]

I'm not 100% sure, but I believe it is a 3/8" BSPT. Something that is hard to find here where most parts are NPT.

Here's another option. http://www.dsmtuners.com/forums/articles-engine-fuel/359004-using-t-install-oil-pressure-gauge.html

Edit: Looks like they do make 3/8" BSPT to 1/8" NPT adapters.

http://store.42draftdesigns.com/Lancer-EVO-18-NPT-Oil-Temp-Adaptor_p_54.html