Factory Tach missing plug?
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There is no corresponding plug to plug in to. I researched the heck out of this forum for days and can"t find an answer. Just frustrated now. I'm missing something in this whole process.
1983 F150 302
1983 F150 302
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I don't know. Previous owner was a 92 year old man who owned it since 85. I recently acquired the truck. All the other gauges work. The speedometer has a date stamp from 1983 which would lead me to believe the cluster is probably original?
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From: Virginia
All the cluster swap threads say you just plug it in and go, the wiring should already be there from the coil minus to the tach. So I don't know what your problem would be, unless the tach is faulty. The coil gets power anytime the key is in start or run, and the ignition module grounds and ungrounds the negative of the coil to make it fire. The tach simply takes this ground/unground signal and does a little math in the circuitry to give you rpm.
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From all of the reading I have done on this site, I am in agreement with everything you've said. Maybe the tach is broken (I have tried 2), but where my confusion lies at this point is the plug with the black and green wire from the earlier picture. Unless I am digesting the information incorrectly, that needs to plug to something for the tach to work. I am not understanding the wiring.
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From: Virginia
Sorry I haven't been more help. I am not sure myself, but you need to determine is the plug you have in the picture coming from the firewall or the engine? 82f100swb alluded in his post that the plug you are looking at actually is the one from the firewall, and you are missing whatever goes to the engine/coil.
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From: Northern Indiana USA
My 84 had the gauges, but no tach. I found a tach in an 86 at the boneyard. It didn't work, until I plugged in the harness in your post 3. Both ends were there, but they had never been plugged together. They were on the inner fenderwell, under the brake M/C.