[AT] high oil pressure

[Nagel, Alan F]

I couldn't get archive access to work, so haven't searched the past record. 
But maybe I'm the only subscriber who is ignorant about high oil pressure.  My Oliver S-55 was working fine a month or so ago, but when I ran it yesterday the oil pressure gauge immediately spiked to the limit.  I changed oil and filter, but get the same result today.
Help, those of you who are not the techno-klutz I am.