I know I'm a terrible person, but i always just tap these things out
to the next pipe tap size. the notion of a non-tapered pipe thread in
cast iron just doesn't make that much sense to me.
Of course I once converted a 1958 BSA A-10 to metric, but that's a
different story. I bet whoever has that bike today wonders WTF.
On Feb 2, 2009, at 7:48 PM, WILLIAM TOBIN wrote:
> Hi Greg: I ran into this on my TR6.
> The difference between the British 3/8 pipe and 3/8 American
> Standard Pipe
> is very small. 1 thread per inch and 0,010 inch diameter.
> I just took a 3/8 NPT tap and tapped the threads in the housing to
> American Standard tapered pipe threads. Very easy, Now the Auto Meter
> adapter screws right into the housing. Before that I brazed an Auto
> Meter
> adapter to an original temp fitting; not pretty but worked.
> I think the part number is 1074-3/8 NPT for the adapter.
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