There is no cable on that tractor. It's an electronic tach. Are all of your other gauges working ok?
I've got the service manual for that tractor. Want me to try to scan and send you that section?
Wanna see the guts of your tractor? Look at my thread on this forum "shrapnel in gear case"
OK. I've got the section of the manual scanned that you need. It's just too big of a file to post here. PM me with your email and I can send it to you that way. Happy diagnostics!!!!!
If you have to replace part of the instrument panel....let me know. I may want to buy parts from your old one.