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Allis Chalmers Discussion Forum

7080 tachometer

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10-25-2007 16:40:10

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I learned from this forum this past spring that the tach on a 7080 is driven or sent pulses from the alternator in order to work. My hour meter works but the rpm does not, so I did brain surgery on the tach only to accomplish broken glass and a messy looking dash. Are there any digital tachs available that would drive off the alternator, or how would any other tach work on this tractor, how would it hook up? thanks, the old farmer in Pa..

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cadet trooper

10-26-2007 14:50:05

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 Re: 7080 tachometer in reply to poppop, 10-25-2007 16:40:10  
I agree with CAL and you might check with your local AGCO Allis dealer just to see what a new one costs because I always do that because sometimes but rarely they can be reasonable plus you can tell if a scrap yard is ripping you off. Tachs on the 7000 series were a hot commodity for awhile but they may have gotten that fixed. We always kept a couple on inventory in parts. That's why I rarely went by tach hours on trade ins because basically they were for the customer to keep track of oil changes and such it's still hard to beat the old mechanical tach.

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10-25-2007 19:56:09

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 Re: 7080 tachometer in reply to poppop, 10-25-2007 16:40:10  
there is a tach that works off injector line pulses "Tinytach" but is pretty small like an hourmeter on a lawn mower. Also cost around 65$....so in my opinion go to a salvage yard and pick up a good used tach/hourmeter. better than rigging something up and i would guess you can get an original working tach for less than adapting one

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