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Originally Posted by MyTaurus8AChevy
A dirty, bad or disconnected sensor would also cause this. Check your's fuses too. I'm assuming that it used to work correctly. I think you can test it with a VTVM but I don't know what range it should fall in. Also you should know that when you remove that center section of the dash that it is hard to snap back in because of the angle of the windshield. If I'm not mistaken you have to snap in the edge closest to the edge of the windshield first to put is back in.
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Wow, it can't be too easy to find a Vacuum Tube Volt Meter (VTVM) these days!
A standard digital multimeter (DMM) should work fine, the sunload sensor is a CDS cell that varies in resistance depending on the amount of light it registers. Unfortunately, I'm also unsure of the "good" range. You could try an assortment of completely covered, partially covered, and sunlight though to see how the resistance changes under those conditions.
I'm going to pose one of MyTaurus8AChevy's assumptions as a question, did the autolamps ever work properly since you've had the car? Is there a chance your Taurus is equipped with Daytime Running Lamps (DRL)? I'm not sure if the DRLs also turn on the dash lamps.
-Rod