My 8v vx (9k miles) does just the same - no / very low indicated oil pressure for 30 i(sh) seconds. Reading between 2 and 4 the rest of the time, even after significant beans!
Doesn't seem to be a problem with my engine. I have always assumed it is the sender, though I might try a different grade of oil at the next change, just to see the effect.
PaulB
Nice car, shame about the hat!!!