I think I’ve located a suitable remote oil pressure relief valve [ turbo supply ]. The Gixer pump puts out 55 psi before the bye-pass opens – I only need 35 ‘ish for the turbo supply otherwise seals will suffer.
The Aussie one is £169 + carriage [ £20 ]
Take a look at the very similar layout of the Mercedes 420 version – £28 !!!!
A supplier in Birmingham [ UK ! ] has them in stock. Only 15 miles away so I plan to call in and have a good look at one.