Best I can remember it's just above and rearward of the dipstick tube, below the valve cover, and behind the hydraulic pump.
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It’s behind the hydraulic pump.
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There are two types of pumps used on the NAA's. A vane style pump, and a piston style pump. Mine is the vane style. The main difference is that the vane style costs about 3X as much to rebuild as the piston. 
Ya, looking at my pump it is piston style. The forward end of the pump protrudes about as far as yours but it is the same diameter as the rear section. This causes the pump to cover/hide the inlet for the sensor. I can't see much of the inlet at all. If not for the picture of yours I would not have known what that little bump cast into the block is.
I have read on the web people saying the pump needing to be removed to replace the sensor. Mention is made of using a 90 degree elbow for the installation. I guess that must be possible but it sure must be very tight fit as there can't be much clearance available.
It looks like your oil tube enters on the top of the access hole. That would make sense as it would not extend the connection further out towards the side of the pump. I would like to have an oil pressure gauge on this old engine but hate to pull the pump off because it's working just fine.
I will hold off from this issue for now as I have other issues to deal with as well. I need to install a new gas tank as well as an alternator and amp gauge. After that I will be a little more familiar with the tractor and may feel more confident about what I'm doing.
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I have read on the web people saying the pump needing to be removed to replace the sensor. Mention is made of using a 90 degree elbow for the installation. I guess that must be possible but it sure must be very tight fit as there can't be much clearance available.
It looks like your oil tube enters on the top of the access hole. That would make sense as it would not extend the connection further out towards the side of the pump. I would like to have an oil pressure gauge on this old engine but hate to pull the pump off because it's working just fine.
I will hold off from this issue for now as I have other issues to deal with as well. I need to install a new gas tank as well as an alternator and amp gauge. After that I will be a little more familiar with the tractor and may feel more confident about what I'm doing.
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