Up for sale is a new Brass Adapter
for a 1/8"-27 NPT Pressure Gauge Sender Unit.

Side A: 1/8" NPT female (1/8"-27 NPT)
Side B: 1/8"-28 BSP (British Standard Pipe) male
The borehole is 3/16" (0.1875") or 4.8mm.

This adapter will only work for pressure sensors; temperature sensors won't fit through the borehole.

Please see photos.
Questions welcome. Thanks for looking.