Can you tell us exactly which hole you mean?
I run an aftermarket oil pressure gauge which I simply tapped into the hole for the oil pressure sender on the back of the cylinders. You'll need a T-fitting if you want to retain the original sender as well.
I went and had a look and I see what you mean now, the main gallery plug on the right side just below the timing cover?
If the engine hasn't been running for a while and it's on the sidestand you may not get any oil running out. If you run the engine and then unscrew it just _after_ you turn it off then you should get oil coming out.
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