Need Help w/ Tach install
Logistics Pro
Joined: Apr 2005
Posts: 4,221
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You might be in luck after all. I just took a look at the cluster that came out of my truck. I expected to see a hook up for the tach separate than the regular gauge and light plug in. Turns out the tach's integrated in with everything else. So unless Ford produced a completely different under dash harness for tach equipped trucks (unlikely) then it's just a matter of where the under hood wires should hook up to feed the under dash.
I followed the circuits, (they are labeled 1,8,G, & B.). B&G just hook up to the light circuits, 8 goes to the top, third from the left connector. 1 goes to the top, second from the left. If the non-tach trucks have wires at these connections and they are not being used for anything else then hooking up that tach just got easier:
I followed the circuits, (they are labeled 1,8,G, & B.). B&G just hook up to the light circuits, 8 goes to the top, third from the left connector. 1 goes to the top, second from the left. If the non-tach trucks have wires at these connections and they are not being used for anything else then hooking up that tach just got easier:
Elder User
Joined: May 2011
Posts: 973
Likes: 2
From: Bellefontaine, OH
photo(19).JPG
this is the beginning of the harness that plugs into the tach sensor
photo(20).JPG
another shot of the wires leading to where they join the alternator harness
photo(21).JPG
and where it all meets together with the alternator harness
this is the beginning of the harness that plugs into the tach sensor
photo(20).JPG
another shot of the wires leading to where they join the alternator harness
photo(21).JPG
and where it all meets together with the alternator harness
Logistics Pro
Joined: Sep 2007
Posts: 3,739
Likes: 181
From: Western Mass
I've never tried to swap housings, just going off what I read in another thread, plus what I did when swapping IP. I'm pretty sure you'll have to take the lines off the injectors to be able to get the pump to move back far enough to clear the housing. You may be able to leave them attached to the pump though.
Senior User
Joined: Feb 2007
Posts: 426
Likes: 0
From: Pukalani, HI
If your housing doesn't have a plug for the sensor, then you probably don't have the wires in the harness either.
Really easy to wire a tach in (I mounted the Ford unit into my Chevy cluster when I did my swap).
4 connections on the gauge, 12v+, two Grounds and one from the Sensor.
The sensor has 2 leads, one will go to the gauge (Sensor), the other can go to a good ground or directly to one of the Grounds on the gauge.
Simple, just took me a while to go through a harness and about 4 connections to find it out.... This goes for all of the stock IDI tachs.
Really easy to wire a tach in (I mounted the Ford unit into my Chevy cluster when I did my swap).
4 connections on the gauge, 12v+, two Grounds and one from the Sensor.
The sensor has 2 leads, one will go to the gauge (Sensor), the other can go to a good ground or directly to one of the Grounds on the gauge.
Simple, just took me a while to go through a harness and about 4 connections to find it out.... This goes for all of the stock IDI tachs.
Logistics Pro
Joined: Apr 2005
Posts: 4,221
Likes: 17
More good info on this topic from another guy that needs reps I cannot give:
Correct. The wiring was already there. But 1983 and 1984 diesels did not have a tach option, and their wiring harness was different. They also lack the threaded plug for the sensor in the IP gear housing. On 80-86 gas trucks the tach wiring is there except if you have a truck with warning lights instead of gauges.
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