Did you test the continuity of the resistor pack? Put an ohmmeter on the two end connections, if you get no continuity, test each coil and find which one is open and jumper it out and it may work again. If you can't fix it that way, I'd suggest not pulling the dash (too much work) and replace it with a solid state infinitely variable motor speed control.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked