Got a 1990 fc just bought, tried taking it to smog as buyer had it pass previously to have it fail to “MIL not working” .

I am still very new to working on cars but so far I’ve tried manually triggering engine light by unplugging maf sensor with no luck. I then decided to pull out MIL and check bulbs, the only bulb that turns on ever is the airbag light as I bought it with them removed and a new steering wheel installed. I tried switching the bulb to a different indicator and the light still turned on in the other slots but the rest didn’t turn on.

Is this just the case of faulty bulbs that need to be replaced? If so where can I get the replacement bulbs and if not what are some possible solutions or troubleshooting methods?

I appreciate any help you all are able to provide and I’m willing to answer any questions to the best of my ability.