When I turn the ignition on, my oil pressure guage reads maximum
pressure and stays there. My mechanic says that the sending unit may
need to be replaced but since my engine is sound and there is a backup
warning light, it isn't absolutely necessary to replace it.

I'm thinking that I may want to replace it myself if I can locate a
service manual. What is the best sourced for parts for this car? Can
anyone provide me with this repair procedure?

Thanks all!