1086 Digital Tachometer

Good morning! I have a 1086 with a digital tachometer that doesn't work. I have 12 volts at terminals 1 and 2 but when I plug into a loaner tach it doesn't work either. I've cleaned up the ground where it attaches to the tractor. I've also used contact cleaner on the connector but still dead. anyone out there encountered this problem on the 86 series? Thank you for your help.
 
those 86 series digital dash units are a bear, on cousin's 886 a 2x4 was mounted behind the steering wheel and on this board was mounted analog tach, oil pressure, volt meter, and temp gauge :)
 
Do you have the data center,(touch pad style) or the knob style. If touch pad style which most have except few early ones, there is a separate fuse that is inline, not in with other fuses. It often gives trouble, not necessarily burn out, but rather making poor connection. You have to have two power sources to the data center and ground but I don't recall which number is other power source, probably number ten or in that area.
 
I hate to say it but, those tachs were junk coming rom the factory. I worked in the dealership back in 79 when those tractors were new and lost count on how many I replaced in the 10 months I worked there. They had a center to send them back to and have them fixed. Kenny
 
I got it going by cleaning the fuse and fuse holder. MPH and exhaust temp work but rpms won't work. Cleaned RPM transducer but still didn't register rpms. New transducer is $222. I want to thank everyone for their advice.
 
Measure the transducer to be sure that you have resistance. Hopefully someone will post how many ohms it should be. With the engine running you should also get a small AC voltage signal between the two leads.
 
We quit farming in 2009. I don't remember brand of tach but it was mechanical with a cable. Oil pressure was fluid type with a line.
 

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