It looks like Dandy Dave has got you covered on this question. Make sure the dipper trays are full of oil when you install the oil pan.
You should always have oil going through the sight glass while running. If you do not see oil flowing when you first start the engine, you may need to prime the oil pump.
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Mark Shaw
BCA PWD Director
HCCA Member (Skagit & Portland)
1913 Model 31 Touring
1915 Model C-25 "Speedster"
1924 Model 45 "Roadster Truck"
1929 Model 29-27 Sedan (Now my son's car)
1931 Model 57 Sedan
1938 Model 48 Sedan