Idiot light idiotic?

[Kerry Griffith <kgriffit@parkcity.k12.ut.us>]

Hi All,
Last night my oil idiot light came on for a few seconds at 70mph. Oil
pressure gauge said all was well, temps were normal. Stopped & checked
dipstick- oil level fine. Drove home gingerly, changed oil (Mobil 1, factory
filter, as always). Went for a short test drive and all was well.
So whazzup? Electrical glitch? Could my oil pump be bad? The car never
uses a drop between changes, and although I'd let the changing go a couple
months longer than normal, I can't imagine the viscosity drop due to age
would cause this symptom. Please help!

Kerry
91 200q