I'm seeing some eratic readings on my oil pressure guage (04 Road Glide). Since switching to synthetics 2k ago, max pressure is aprox. 30psi (used to be 32 on dino) but sometimes it will be down around 24 (2500-3000 rpm). Idle will be anywhere from 8 to 16 judging by the hash marks on the guage. Bottom line, pressue readings vary from one time to the next at the same RPM reading. Logic tells me to pull the sending unit and verify readings with a mechanical guage. If that backs up the dash guage readings, is it possible that the pump bypass spring has become weak, broken, end coil wrapped over the roll pin, etc. that would allow the plunger to lift prematurely (and inconsistantly)bleeding off some pressure at various RPM ranges? Not hearing any strange noises, light doesn't come on. Its:cheers just that the guage reading varies and seems to be deteriorating over the last few days. I've compared it to a friends 07 RG, his max pressure reads approx 36 and drops accordingly with RPM drop but remains consistant. Can the bypass spring be pulled and checked by removing the cam cover alone?