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Old 04-20-2009, 02:22 PM   #1 (permalink)
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Oil pressure switch thread size.....

Hi guys

Having some problems:

Im trying to fit a mechanical capillary oil pressure gauge.

The oil pressure switch screws snugly into the T-piece adaptor. The T-piece also screws nicely into the T-piece adaptor....

so why wont the T-piece screw into the stock switch position on the head???

The threads look identical - and both tapered pitch.

Any help really welcome!!!!
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Old 04-22-2009, 06:06 PM   #2 (permalink)
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Because the head is tapped for a 1/8bpt(british pipe thread). You will need a 1/8bpt to 1/8npt adapter.
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Old 05-12-2009, 04:20 PM   #3 (permalink)
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Sorted - re-tapped the thread at the same thread of 1/8bpt and it now fits. Must have been dodgy machine work.

Electric sender was the problem as the mech gauge shows healthy pressure.
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Old 05-19-2009, 04:07 AM   #4 (permalink)
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