I recently fired up my engine after it sat dormant for quite a long time (thanks to the "ex" graemlins/angry.gif ). The oil pressure guage, which is a mechanical guage, shows a very noticable fluctuation (or needle bounce) of about 5 PSI at all RPM's. Any ideas?

Since I mentioned the "ex" graemlins/angry.gif , prior to starting it, I did do an oil change and a preliminary check for foreign objects in the valve covers, etc. Thanks.