My oil pressure light came on the other day when I slowed down at a traffic light. I turned the engine off an checked the oil and found I was 1 qt low. I added the qt and the light was off. On my way come it flashed twice. I changed the oil and filter and today I have the same issue. I started the engine and looked down the oil fill tube and it looks like there is oil in the top end. I checked the wires going to the oil sending unit and they appear to be fine.
Has any one had any issues with the sending units or the oil pump?

The sender is the mostly likely problem, but you won't know 'till you check the oil pressure with another gauge. For your purposes, it can be temporary.

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Matt B.

05 Limited CRD. Bought it new. 112k on the clock now.

GDE Eco-tune, rear differential drain plug (drilled and tapped the pumpkin), transmission pan drain plug, Fumoto oil valve, fuel filler neck restriction removed, front hitch, Hayden fan clutch, Sears P1 battery since 08, Mobil 1 5w40, 5 volt glow plugs, DIY timing belt at 109k

Harbor Freight has an oil pressure test kit for $20, and the sender is like $65 at the dealer. Not a bad kit, it threads right into the sender's socket behind the oil filter on the passenger side at the bottom. Easy to get to.

If you don't have a Harbor Freight near you, I'll happily send you my kit for $20 shipped. I only used it once, and I don't expect to be using it again anytime soon, I'm going to install a REAL oil pressure gauge with the new engine.