first proper ride since getting my old tbs back and once warmed up the oil light flickers at idle, it goes out over 1200 rpm, but i just unscrewed the oil sender and bolted in a snapon oil pressure tester, it was showing 8 at idle and only 20 at 3000rpm, book says should be 40 at 5000rpm, i couldnt get pressure above 20! previous owner knows nothing about these so whilst he had it the local triumph dealer serviced it and stripped sump plug! they pulled pan and fixed this and can only assume they would have checked or cleaned filter etc while pan was off, bike runs on motul 7100 full syn and is fresh, i am at 90000km but it runs ok, would it be more likely to be oil pump or relief valve/ or should oil pressure be checked at the pipe to head and not switch? although i would think it should give same reading, dont want to pull pan yet as dont have gaskets and will probably need to order them in, thoughts??