I have seen a few instances in car engines where aftermarket main bearings and rod bearings do not have the same radius on the edge of the bearings as the originals or the crank had been turned and the machine shop did not put the same radius back on the crank. Those things can also bleed off oil pressure. I know you didn"t have your crank turned but if there was any difference in the bearings radius it can cause it to drop some. I agree with everyone else, just run it. My TO-20 only shows about 20 when it"s cold and then it drops, but an engine only needs 10 pounds of pressure for each 1000 rpms that it turns. So these old low speed engines will live a long time with low oil pressure. I"ll take low pressure with modern oils over high oil pressure and the oil they had back when these tractors were new any day.
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