416 low oil pressure at idle

How are you reading the oil pressure? Are you using a mechanical gauge or a gauge with an electrical sender? If you mix gauges and senders you can get strange readings as well. For reference I am running a stock block LA 360 put together on the assembly line many moons ago. With 20w-50w I am reading 60-65 PSI cold and 25psi hot on two different gauges. I hope it is something simple.