Reason for the question is i have some bulbs that are burned out which light up the speedometer. I figured that I would remove the cluster and give it a good inspection, and replace the bulbs. Many years ago a back brake lines got damaged from road debris and leaked . This illuminated the brake light because the piston in the distribution block had shifted to use the front brakes since there was no fluid to power the back brakes. After the rear line was replaced and the brakes bled, I could not for the life of me centralize the distribution block piston (this shuts the l red brake light off). I even took my car to a brake shop and had them try to get the light to go off, no luck. I ended up just pulling the electrical connector off of the distribution block, no light now. Thanks to your replies I know I am not the only one with this issue.
I had seen a seat belt light that was mounted on the lower edge of the dash board before, I thought this was just added from a earlier model. As Paul stated there never was a seat belt light and relay for the cluster, so the under dash belt light must have been a dealer option, unless the convenience group was installed from the factory.