It is an alternative worth considering, however, thinking back to when I fixed the one on the '83 (which wasn't working when I bought the car) I remember that just removing and reinstalling the cluster (which includes removing the odo from the cluster which you also need to do if shipping off to repair) was half, if not more, of the work.

So you're weighing $69 for the gears shipped plus installing them (removing the old crud) against $125 plus paying for and going through the shipping rigamarole - paper work, proper protective packaging, taking it to the USPS/UPS and waiting for the shipment - can you drive your car for a week without instruments?

I happen to also be weighing this now since I'm now only getting about 75 miles on a tank of diesel in the '85

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'83 SD, 2x '85 SD
You are entitled to your own opinions, you are not entitled to your own facts.