Oil sandwhich plate size for my cup?

[Dangerous_dave]

What size is the thread, for the oil sandswhich plates etc for mys 172 cup?

http://www.demon-tweeks.co.uk/products/ProductDetail.asp?cls=MSPORT&pcode=MOCSP1

Want to fit oil temp and Pressure guages, will be running itb's next month and want the added guages for checking installed prior etc.

Is it the 1/2 Bsp one thats not listed?

Cheers

 

[LegoHead]

I think its M20 bsp as you are using the face of the plate to seal. Ebay has a few on there you cant really go wrong with.

 

[Dangerous_dave]

m20thread and 1/2" are different right... eeek