Oil light on for no apparent reason on 1956 Thunderbird

[zuburg]

I took my 1956 Tbird for a spin and noticed the oil light was on. No oil leaking on garage floor. Oil level is good. Car seemed to run just fine, temperature was good.


Background: This engine has very low miles since it was remanufactured. I replaced the oil sending unit last year when previous one was pouring out oil. I ordered a new one (since they are cheap and easy to replace) but wanted to ask what else could make the light come on?