Maintenance required light on how do u turn it off autozone said car is to old to check with meters.

Try disconnecting the battery for ten minutes.
These old systems also would throw a code for the check engine light to come on and you would turn the ignition key on and off three times...on the third turn leave it on...read the flahing light, example a code 23 would be two consecutive flashes...pause...then three consecutive flashes it would repeat the same code process three times then go on to the next,....when the codes were through the last code would flash a code 12...one consecutive followed by two consecutive flashes.
The code breakdowns are in the old Chilton manuals which for free can be found on AllData.com or at the public library.

Need to fine a repair shop that has a snap-on scaner, with that the light can be reset.