Thanks TnBob!
I just had another speedometer in over the weekend. The owner said that the alternator on his SDL failed and sent out a massive voltage spike through the car's electrical system. It took out the speedometer. I didnt quite know what to expect luckily the damage was not very severe. The spike was absorbed by a resistor and capacitor, both of which died.
Some pics!
W126 Speedometer Repair - Imgur
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(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)
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