Thread size/type on oil pressure sensor ??? - Alfa Romeo Bulletin Board & Forums
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post #1 of 2 (permalink) Old 06-18-2007, 06:19 PM Thread Starter
Join Date: Mar 2006
Posts: 12
Thread size/type on oil pressure sensor ???

Does anyone know the size and style of threaded connection on the oil pressure light sensor on my 1974 Spider? I recently changed the sensors (wish I did not throw out the old sensors) but would like to compare the readings with those from a mechanical gauge. I have a mechanical gauge with 1/8" NPT but I am sure the Alfa connections are metric. Are the treads machine or tapered pipe threads? I am unaware of metric pipe threads but they most likely exist.

I could pull the sensor and try to figure it out myself but I tend to work on my little Italian girlfriend on Sundays and would prefer to have the parts/fittings on hand.

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post #2 of 2 (permalink) Old 06-26-2007, 07:31 PM
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Location: Atlanta, GA
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I replaced the sender on my '89 Spider about 3 months ago. I used a friend's mechanical gauge to check pressure - I belive the hole is 10mm. And I think the pitch is 1.0 mm (fine thread). I gave the gauge kit (Snap-On) back right after I was done, so I can't be sure right now. I don't think there's any difference with the older engines.
Take a 10mm open end wrench and fit it to the threads on the sending unit. If it's a close fit, it's a 10mm fitting. 1/8" NPT is a little smaller, I believe, and the thread pitch is more coarse.

[COLOR=Navy][FONT=Comic Sans MS]Geo.
Monroe, GA
89 Spider Graduate
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