Since my oil pressure warning light came on and the pressure bypass section of the oil pump looks good, I was going to install a pressure gauge to find out what the true pressure is.

I see that most have a 3/8" fitting but it looks as if the pressure sending unit has a large 5/8", fine thread fitting. Should I find adapters or is there a pressure gauge that will fit?
Does anyone sell replacement oil pressure sending units for the warning light?

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Never seen a Valiant I didn't like!

Any auto parts store should have the sending unit. As far as the mechanical gauge goes, some kits have a couple diffrent addapter and if yours does not then a good hardware store with brass fittings will do the trick.

But before you change the sending unit check and make sure the wire is in good shape. I found mine became brittle from the heat and was grounding out making my light come on.