Out Of Th Blue? Has the oil pressure worked different and NOW is having this change... Nothing mechanical done to the bike to Justify this pressure Anomaly?
Is the bike running at a specific RPM or Idle when More pressure is shown and dropped?
Not unusual for the oil pressure to Fluctuate especially running at cruise or high RPM when oil is cold. BUT it sounds like this just started? ? ?
Mine (newer of course,,,,09) runs about the same (55-60) as it warms up to running temps. , drops off with the RPM drop or when fully warmed...
Your pressure relief valve spring may have a little more spring tension and it Will Show up as a Bit more pressure than the next bike...
Now IF it does this constantly ? Hot Cold any RPM; Then you might have a sender unit going out (if electric) OR if pressure; might be the gauge its self not accurate...
IF stock oil pump cam-plate...., I thing the above will give you some where to start...
Get back with some answers from the above Yada-Yada... and we'll help you out...
signed....BUBBIE