Finally got around to it, but here's the schematic I painted to allow the Hobbs pressure switch operate the pump as well as the manual I/c switch operate the pump if need be.

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What's the toggle switch for?
Why switch the positive? My schematic had the switch in the earth side.

Toggle switch is there, so I can switch the system of if need be. Yeah I know, will make another schematic, so the switches are on the earth.

i gave muggz (i think) a copy of my schematic that included using the auto & manual gc8 sti spray buttons, worked a treat, i got it out of wilmo's 'modifying a gt forester' pdf, somehow since MRT now host the document the bit about the waterspray has disappeared and there seems to be alot more ecutek info in there