Factory Tach Install
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Mountain Pass
Joined: Dec 2003
Posts: 168
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From: NJ
Factory Tach Install
My buddy gave me a factory tach he had in his shop. He said it was from a 86 Bronco w/ automatic xmission. Will this work in my 86 F150 and is it a diffult operation to install? Thanks,
Elder User
Joined: Sep 2003
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Is the Tach installed in a guage cluster or is it seperate?
If it's in a cluster, you should have the circuit board with plug-in connector.
Just take out your old cluster(Un plug & spedo cable) and plug-in and connect speedo and off you go.
If you have a 300-6 there is no change to the wiring it's "plug & play" if you have a V8 you need to connect the black wire in the harness to a ground location.
If the Tach is seperate and needs to be installed in a cluster, you'll need more help.
Post again with details.
If it's in a cluster, you should have the circuit board with plug-in connector.
Just take out your old cluster(Un plug & spedo cable) and plug-in and connect speedo and off you go.
If you have a 300-6 there is no change to the wiring it's "plug & play" if you have a V8 you need to connect the black wire in the harness to a ground location.
If the Tach is seperate and needs to be installed in a cluster, you'll need more help.
Post again with details.
Logistics Pro
Joined: Jan 2002
Posts: 3,739
Likes: 3
From: GANS
Actually, no.
the tach goes off the coil, not the cylinder #1 plug wire (like a timing does). The coil fires one time for each cylinder. If you have 8 cylinders, that means it fires 8 times for every 2 revolutions. (4 strokes turn over once without firing, 2 stroke tachs are different from 4 stroke as well). So that means it has divide the number of spark pulses in a second by 8, then multiply them by two for an accurate reading.
BTW, if you look on the back of most common tachs (ie, sunpro), they have a switch or a bank of dip switches to setup from 4,6,8,10. Never had a AutoMeter, but they probably do the same thing, unless they can auto-sense the number.
franklin2- as Oscar Meier said, there's a black wire that needs connected for a v8. From what i've heard, it just needs grounded.
the tach goes off the coil, not the cylinder #1 plug wire (like a timing does). The coil fires one time for each cylinder. If you have 8 cylinders, that means it fires 8 times for every 2 revolutions. (4 strokes turn over once without firing, 2 stroke tachs are different from 4 stroke as well). So that means it has divide the number of spark pulses in a second by 8, then multiply them by two for an accurate reading.
BTW, if you look on the back of most common tachs (ie, sunpro), they have a switch or a bank of dip switches to setup from 4,6,8,10. Never had a AutoMeter, but they probably do the same thing, unless they can auto-sense the number.
franklin2- as Oscar Meier said, there's a black wire that needs connected for a v8. From what i've heard, it just needs grounded.
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Mountain Pass
Joined: Dec 2003
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From: NJ
The 6.9 diesel tach connects to a pickup (transducer) which screws into the top of the timing gear cover.
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Tuned
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Senior User
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i have a factory tach set up out of a bronco in my 84 F250 and it works fine after i used the curcuit board wiring and the tach i didnt have to hook up any black ground wire unless i need to and i havent or it already has been connected it seems to read correctly at 65 mph its at 3000 rpm's there soemthing im missing that may ruin my tach ? i dont want it to this is the second one ive found the first one didnt work right to begin with
