Do you want to fix it so you have a tach, the hour meter, speedometer, or all?
Seems very likely the mechanical tach/hour meter in your 580CK isn't going to be working right anyway - even with a good cable and tach-cable hooked to it. I've come across very few that do.
I've had several 580CKS (still have one) - all with 188D or 207D engines and several had the old generators with tach-drives removed and Delco 10SI alternators put in their place. Some later engines had tach-drives bolted onto the engine - I think the 580CK I have now has one - although I don't have it hooked to anything.
If you want to spend the time and money - the mechanical tach - if you pull it out - will have numbers on it that indicate the ratio it runs at. As to mechanical tach drives - I think you can stick one from a newer engine onto an old one - but I'm not 100% sure - and I don't have any old ones here where I can see easy ( I do have one buried in my steel scrap pile).
If you don't need to keep it original, you can buy an aftermarket diesel tach that will run off a stator-tap from the Delco alternator. As to an hour meter - just needs 12 volts of power when the tractor is running - you can buy just about anywhere.
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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