Oil pressure switch

[Blu3R]

Can anyone tell me what size the oil pressure switch thread is please? I need to buy a tee to fit a pressure gauge.

[GTO600]

Blu3R said:

Can anyone tell me what size the oil pressure switch thread is please? I need to buy a tee to fit a pressure gauge.

I think it's 3/8 NPT, you also have a port at the rear of the engine below the exhaust manifold.

[andygtt]

GTO600 said:

Blu3R said:

Can anyone tell me what size the oil pressure switch thread is please? I need to buy a tee to fit a pressure gauge.

I think it's 3/8 NPT, you also have a port at the rear of the engine below the exhaust manifold.

...... which is a MUCH better location as the T at the front can interfere with the alternator etc and end up leaking as mine did.

[Blu3R]

Thanks guys, is the other point the same size?

[andygtt]

I have an engine on the bench, you can check it tomorrow

[GTO600]

Blu3R said:

Thanks guys, is the other point the same size?

I think it's the same size both sides.

[Jim O.]

If the UK engines are the same as the ones that we use in the US, the oil pressure switch over near the oil filter is a smaller port (1/8 or 1/4 NPT), and the port next to the rear exhaust manifold is much larger, like 1/2 NPT or so. On the US cars, we run an adapter that changes from the hole in the block to -3 AN, which is the size of the line that runs to the oil pressure gauge in the dash.