My Digidash kit came with a dedicated oil pressure switch. This appears to have a tapered thread ( NTP ? ) which screws into a separate brass union which fits the block ( Ford Sigma ). It is very difficult to get any significant torque onto the switch due to restricted access, a small pipe wrench onto the body is the best I can do. I am wondering whether the use of thread sealant would be a good idea and if so what. I may need to get it out at some time! TIA.

tapered threads shouldn't need to be any tighter than just nipped up with an appropriate size spanner

the taper should be more than enough to seal it up, if you over tighten it'll just damage the threads

If it'sthe usual 2wire switch then it doesn'tneed to earth through the body and PTFE tape will be fine. However those type of switch do seem to fail due to vibration and are therefore often fitted in a remote location on the chassis with a flexi hose. Would that also give you better access?

Liquid ptfe is good for tapered threads

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Originally posted by adithorp
If it'sthe usual 2wire switch then it doesn'tneed to earth through the body and PTFE tape will be fine. However those type of switch do seem to fail due to vibration and are therefore often fitted in a remote location on the chassis with a flexi hose. Would that also give you better access?

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Hi
I had the same problem pretty sure i put the tapered thread into the connector first in a vice with inserts to protect the threads then used a spanner to inset the connector into the block you may have to bastardise a cheap spanner or buy a set of curved ones (cant remember what they are called) as it is a nightmare with its location to get the room to tighten.
The digidash guide does say to earth all sensors but i will turn it on first and if i dont get a signal then think about earthing it, if the worst comes to the worst im sure some bare copper wire wrapped around the threads over and over again and then held in place with solder or tape will do it.

Nick M