Anyone ever run into this before? Every now and then...and it's been happening with increasing frequency...when I fire up my '04 Sport with the semi-hemi, the oil pressure gauge stays at zero, and the "CHECK GAUGES" light comes on.

If I shut down and restart, the gauge reads normally.

I'm leaning towards a bad sending unit, because there's no ticking, clattering, or any other evidence that the oil pressure's really zero.

Thanks in advance! Carl