Oil pressure switch thread size

[jagnut66]

Hi,

Please can someone confirm what size the thread is for the oil pressure switch, where it screws into the side of the engine block? 

Is it 1/8th NPT?

I have found this but is it the right size for the Herald engine? https://www.ebay.co.uk/itm/273520725705

I ask as I need to replace it with an adapter like in the attached link, so I can fit an oil pressure gauge.

Two gauges I always fit: Water and Oil: I prefer to see what the water temp and the oil pressure are doing, before a warning light shows in the speedo, by which time it's usually too late anyway.....

Many thanks,

Mike.

[Pete Lewis]

just use a TEE  listed for triumphs 

https://rimmerbros.com/Item--i-RX1352

Pete

[Jeffds1360]

I used this

https://www.ebay.co.uk/itm/283301160575?hash=item41f610a67f:g:VNkAAOSwADxbbvdf

Can take temperature too