Following on from my previous comment really ... Merlyn pressure gauge is mounted on a brass pillar that has an 8mm thread into the action. Looking at the gauge, which is clearly screwed into the pillar, it is clearly not 1/8 bsp. But does anyone know what it is? I have not split the gauge from the pillar as I do not know, yet, if the leak is from this joint. Could it be 1/16 bsp?
Does a replacement gauge, if I need one, have to come from Daystate? all the gauges I have seen so far (e.g Best Fittings) have a 1/8bsp thread.
Just trying to be prepared for the worst ....
All advice appreciated.
Cheers, Phil