What size and pitch are threads on oil pressure sender?

[tailwind22]

What size adapter is needed to connect my 1/8 pipe thread male fitting on my mechanical oil pressure guage to the oil pressure sender block? Also, having trouble finding where to purchase. Any help appreciated.

[larrym]

which engine - what sender location?

early engines had the sender near the FW end, later ones had it in a special fitting at the fan end - some had a 1/8 size and some were larger

some had a dual sender for light & psi, some had 2 separate senders at each end as above, for same functions

- and then there are adapts for marrying the two sender thread sizes

Patrick MS has been advertising a sender/adapter on eBay recently,

and i was able to source the later style on eBay fom another party along with the adapter from the larger to the 1/8 size

tomorrow I'll check those for sizing & will post later

.

[tailwind22]

It is a late 78 3.3 930 turbo engine. My measurement says that it is a 17mm and I assume a 1.5 pitch? Just want to verify. Googling has not found that size of adapter.

[KTL]

The one that Patrick offers is a two pole that goes on top of the engine at the flywheel end. The adapter they use must be M10 x 1.0 to M18 x 1.5 The reason I know that size is because the original case adapter for the single idiot light/oil pressure warning switch is in that location, and I have a mechanical oil pressure gauge connected there. It was adapted by the previous owner with a brass tee that tapped into that M10 hole and converted it to 1/8 NPT. So I removed that brass adaptation and installed a M18 x 1.5 to AN-6 adapter to plumb my mechanical oil pressure gauge and pressure sender.

[KTL]

Forgot to add that the single pole pressure sender that is attached to the engine case right side of the fan with that adapter block has a much larger base thread. I've been meaning to measure that big threadbecause I have been thinking about pulling my oil pressure signal (AutoMeter electronic peak/warning pressure gauge) from that location.

[tailwind22]

Ordered the adapter from Patrick today. Sender threads are 18M x 1.5. Adapter with male 18mm 1.5 to 1/8 npt was $18.