Do all digits light up when you turn switch on. If not, you may be lucky , there are two power sources to the tach, one is switch powered, other is live all the time. There is a inline fuse for tach down by the other fuses and may just be corroded. I always check for power and good ground at the connector that hooks into rear of tach. All pins are numbered, however I don't have diagram in front of me . I think number 1 is keyed power, two is ground and then about 9 is from inline fuse. At any rate, you need power to two pins. You have an rpm sensor reading off flywheel, and mph sensor reading off transmission gear. Not likely one of them if neither rpm or mph work. Original data center was not very reliable therefore they switched to the Dickey John one , similar to 50 series tractors. Check your grounds, connections and if all else fails the unit can be sent in for repair. We always sent ours to a place in Iowa, new ones are very expensive.
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