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Generation 7 1980-1986 F150, F250, F350

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  #1  
Old 06-23-2017, 10:00 AM
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adding non factory tach

I have the 86 diesel IDI in my 1984 F350 and it has no tach!
It has oil pressure guages and alt. chg guage.
Can someone tell me where to wire the tach to?
thanks john
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  #2  
Old 06-23-2017, 07:35 PM
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It would require a sensor threaded into the injection pump housing, and then the dash tach. For aftermarket, they generally read off of the alternator.
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Old 06-27-2017, 09:19 AM
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Thanks for the reply ! It has a sensor there but I have aftermarket so if it connects to altenator what does it connect to on the alt?
Thanks John
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Old 06-27-2017, 08:25 PM
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It hooks into the wiring I think. Never done one, but it reads the pulses from the alternator, and somehow you calibrate it to the rpm.
__________________
My trucks:
The workhorse, 86 F250 4x4 6.9 nat aspirated, 3.25 exhaust, custom intake, electric fuel pump, otherwise well used stock... not real pretty but just loves to work!

The other heavy hauler, 92 F350 2wd dually crew cab, flatbed/toolboxes, 92 Cummins VE 12V with intercooler, NV4500 manual

The beater: 88 F250 4x4, 5.8 5 speed
The project ... 1978 F150 4wd shortbed 351 auto

ASE certified parts specialist
I do most all of my own work so I know who to complain to..Roger
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