Don't know if you solved your oil pressure issue/non issue on the 8N. Most oil pumps have a relief spring that goes bad with time. You can shim it with a couple of washers to gain oil pressure. I know the NAA it is on the pump directly, it may be externally accessible (very front of the engine??) on your 8N. Quick and fast fix.
@@DereksWorkshopAndProjects Thank you. I live in SoCal, North San Diego and with the draughts we have had, my soil is hard as a rock (old avocado grove) and I want to break it up and level some spots for car parking and car/tractor cover areas. You tractor seemed to handle it fine and the TS implements out here are 1/2 the price new of a good used Deere, Ford, Ferguson, Gannon, .... very well used and very old. And you have to hunt all over SoCal to find them at a tolerable cost. So a TS one that can work for 10 years could be good enough considering the low cost and availability.