I have a Mk1 Focus ST 170 engine in an MK kit car. Can anyone tell me what the thread of the plug (which I've read goes straight into the oil way) circled in green in the photo below? It has a T40 Torx bit head. I need to know so that I can buy an adapter for an oil pressure sender I have for a SPA gauge. The sender is 1/8 NPT.

Thanks in advance,

Elvis.