Gonzo
For the record... in the process of fixing this, I discovered:
- The pressure gauge has a 1/8" BSP thread which was difficult to detach from the hex bush below it. Working it backwards and forwards with 14mm open-enders got it apart.
- You could probably replace the gauge with any ordinary industrial gauge
- The hex bush has a M12x1.0 thread into the top of the sight glass housing
- When putting it back together, tighten the lower bush against the sealing washer first, then apply thread sealant to the gauge threads and screw down until it's almost tight. Stop when the gauge is facing the right way and let the sealant cure.

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