Some time ago, a long time now, I removed the oil pan, oil pump, and bearing caps, in part because I was concerned that the oil pressure gauge showed no pressure immediately after starting the tractor (when there was a loud noise present). A local old tractor rebuilder looked at the parts and recommended that I put the engine back together as the parts indicated very little wear. I later tracked down the noise to an hydraulic pump issue and assumed that I had panicked and had not given the oil pressure gauge enough time to respond before shutting off the engine. So after a long delay, this last Wednesday I got the tractor running just long enough to set the timing, and it purrs so nice

1) ignore the issue. I am told "old tractors take a while".
2) replace the oil line with oil line kit for IH560 tractor (of similar design to the very small diameter OEM tubing).
3) replace the oil line with larger cooper tubing, based on the thought that in the cold MI weather the small tubing may contribute to the delayed reaction.
While I prefer to keep my tractors as OEM as possible, I am not opposed to making minor changes it there is a good safe reason.
Thanks for any advice. Phill