Oil Pressure Switch Thread Size

Hi All,
 
I am purchasing a T-Piece adapter for my oil pressure gauge, but for the life of me I can't remember the thread size for the where the oil switch sits in the engine. My oil pressure sender is 1/8”- 27 NPT
 
So this would narrow my choices down to either part number
 
I have found 5 different sizes :
 
Part No.        Thread A             Thread B            Thread C
 
230.031         1/8 NPT             1/8 NPT              1/8 NPT

230.032         1/4 NPT             1/4 NPT              1/8 NPT

230.035         M14x1.5mm       M14x1.5mm       1/8 NPT

230.036         1/8 BSPT           1/8 BSPT            1/8 NPT

230.033         M10x 1mm         M10x 1mm          1/8NPT
 
Where:
Thread A is the male thread to the engine block
Thread B is the female thread in end of T-Piece
Thread C is the female thread on side of T-Piece 
 
Thanks guys.

^^^^Also available through ENZED
 
The postage price alone from that seller is more than the fitting from Enzed. But still a good thing you posted that up Matt, it helped the guys order it for me. Cheers  
 

Thanks guys for the info. 
 
 

Can I suggest that you also replace the oil pressure sender for one with a much higher reading around 30psi or so.  
 
This i=ensures that if the light comes on you will have have a chance to shut down and possibly save your engine rather than the light come on to tell you your engine is rooted.
 
Cheers
 
Matt