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Rick, Several factors can affect the apparent oil pressure. BTW great oil pressure indicated on your 8N, Even though some will declare the pressure too high for your tractor, consider the gauge a relative indicator until calibrated and certified accurate over the entire range of the gauge. You've recently had a rebuild, therefore you'ld expect really good oil pressure. The break-in on your rebuild will account for some pressure loss, from newly rebuilt indicated pressure. The number of hours on this oil change will affect indicated pressure, as will visicosity of oil if different from perviously noted oil pressure. Could your previous oil indications been observed under different ambient conditions? Winter time pushing snow at 18 deg F, a warm tractor may indicate a different oil pressure than on a hot(98 deg F) humid summer day brushhogging the back 40 when weeds and brush are knee high, ticks are crawling down your neck, chiggers around your beltline and dang I just ran over that cooler o' cold beverage. Well, I would keep the oil pressure in mind and not relying on my memory for such fine details, I'ld be likely to record the indicated readings where I would not forget them. The wife's garden journal is a good place to find weather, spring plant growth, insect observations and oil stained pages as I thumb through to find my previous oil change dates/tune ups and oil pressure records. The important thing is that now you've noted an apparent trend of declining oil pressure, you'll be bothered enough to check it on a regular basis. Expect a continued decline of oil pressure over the next 55 years or more. Any rapid futher decline in the oil pressure will prompt a response, probably sleepless nights, reliving the entire rebuild process, step by step, forever questioning that torque spec on the third bolt in the rear..... Don't worry too much at this time. Do log it, the type of oil, ambient conditions, work the tractor has performed, date and hours of oil change. Enjoy the ride. ATW/WA
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