Hi All,
I can say my problem with oil light has been rectified, after a lot of suggestions, it has worked out, fitting an oil pressure guage was a big problem solver, it showed that I had reasonable pressure and that I didn't have to lip test riding, replacing an oil pump didn't solve the problem, original re-installed, washing out the oil tank didn't solve the problem, it all came down to a twist in the oil line, only noticed this when removing the oil tank to wash out, once carefully reconnecting oil lines and keeping them straight, the oil pressure light didn't glow whilst test riding, I have down 400kms now oil pressure holding,
thanks to all who offered suggestions
alex