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In all reality, I doubt if high oil pressure will have any effect on the "seals" in an 8N tractor. The rear main seal will not be affected by the oil pressure, since there is provision for the excess oil to drain back to the crankcase, and the excess pressure is NOT applied to the seal. The front seal is no where near the pressurized front main bearing, having the timing gear between it and the main bearing. The worry I would have is extra, unnecessary stress on the oil pump, which is none too robust to begin with. As far as the gauge fluttering, I am convinced that is due to a replacement gauge lacking an oriface small enough to dampen fluctuations, or the lack of a fitting with some restriction at the gauge connection. I am not sure what the original setup was on these, but normally there is some type of oriface built into the gauge, or the fitting attached to the oil pressure line that dampens the action of the gauge. (My free opinion- you get what you pay for!)
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