SOURCE: i have a 1974 shovelhead harley iv built from the well, I've got no experience with TP oil pumps but I do have experience with S&S and Ultima. This is common on Shovelheads. When your engine gets hot, your gauge will show zero or very little oil pressure when idling. If you think you've got problems with oil, when it does this, pull the dipstick out of your oil tank and watch.
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