There is a spacer that goes in between the head and the sender bulb, to keep it
from deforming.
FWIW
David McCartney wrote:
> Our BMC cylinder heads come with 5/8 fine machine thread.
> Often, accessory gauges come with 1/4" pipe thread, which
> looks the same, but is a bit coarser and is tapered.
>
> The first one I fitted went in okay and may have sealed, with
> the plumbers tape and tightness, but the capillary tube deformed
> against something inside. No readings occurred.
>
> The next gauge I bought had the same thread, but I had a
> welder pal make an adapter with 5/8 fine male and 1/4 pipe
> female. It fits and it works. Perhaps it's the right way to do it.
>
> Captain Rapture
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