Brad,
I put a table spoon or so of marvel mystery oil down the spark plug holes in my 235. It had sat for 40 years before I started it. A little oil, as others have already said, sure helps things along.
You might want to also squirt some oil over the rockers and valves, and turn the engine over/ start 'er up with the rocker arm cover off, to verify that there is oil up in the rocker tube.
You can "Tee" the aux pressure gauge right at the block where the factory gauge line come off. This is also where the oil filter is "Tee'd" into the oil pressure.
Your FLAPS will have the fitting you need, it should be 1/8" NPT. They should also have a cheap gauge, as fitted on compressors and such, you only need a gauge that goes to 30 pounds.
