Oil Pressure Switch

[moggiethouable]

No -.- the gauge doesn't use a pipe! The Switch/ sender won't fit I'm to the engine because the thred is a tiny bit different.

I'm intrigued that the pipe is surplus to requirements, you will have to send photos of the front and rear of the gauge.

[foofoournan]

Get parts with the correct threads in the first place...........Mixing and matching is a BAD idea.

We'll it's tte right thread but the thread it's self points in a different direction.

This is what im looking at, I would like the set the only 2 I don't have is this and water temp
http://www.ebay.co.uk/itm/2-52mm-12V-Di ... 3cc82468b9

[moggiethouable]

Gosh, its certainly very "pimp my ride," however, male bsp to female npt are as rare as hens teeth, you could do it with a 3 piece combo, but my advice would be think about other options, if you find an adaptor at perhaps www.burnettandhillman.co.uk or www.legris.com or some other industrial supplier you will probably have to buy a packet of 10.
If you are hell bent though, find a local pneumatic company in your area, through yellow pages and they may be able to help.
If the engine block is 1/8 bsp you need a 1/8 male bsp to 1/8 female npt adaptor.Or tap out the T piece offered at esm 1/8 npt, if you can find a tap,as for me, I like analogue.
Good luck.

[bmcecosse]

Good grief.........

[IslipMinor]

eBay listing:

http://www.ebay.co.uk/itm/LMA-Oil-Press ... 4604075b9c

Says it is 1/8" BSP for the block and 2 x 1/8" NPT take-off. If your oil pressure light switch is the normal 1/8" BSPT, although not ideal, you can screw 1/8" BSPT into a 1/8" NPT tapped thread, as the BSP thread is slightly smaller and the thread angle is 55° against 60° for the NPT. Use some PTFE tape to make sure of a good seal.

1/8" NPT into 1/8" BSPT is not a good idea as the thread diameter is slightly larger and the thread angle greater, so it will not engage very far and could be unreliable. Equally do not try to screw a parallel thread mismatch together - that really does not work!

[ndevans]

Confused now.
I thought the block fitting for the oil pressure switch was 1/8 BSP? 1/8 BSP is 28TPI. I have a T-piece which screws in, but which is 27TPI. Presumably therefore it's NPT? So why does it fit? It goes in at least halfway along the thread before it gets too stiff to turn by hand.

cheers N

[IslipMinor]

Since the previous post in 2012, it has been confirmed in various posts that the block thread is 1/8" NPT.

[philthehill]

Does the 'T' piece have a taper thread where it goes into the block? If it does it will only screw in so far and not go fully home.
The 'T' piece can be supplied with straight or taper threads where it fits into the block but in the main they are taper threads.
Both of the threads for the switch and adapter have straight threads.
Oil pressure switches for the 'A' Series are/can be supplied with both taper and straight threads.[frame][/frame]
The tap screwed into the adapter is 1/8" NPT x 27TPI.
The oil pressure switch fitted into the adapter has a parallel 1/8" NPT x 27TPI thread.
A 1/8" BSP x 28 TPI tap will start into the adapter but of course will soon starts to lock up and if forced further will damage the threads of the adapter.