Tach not working
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Senior User
Joined: Apr 2017
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Tach not working
Hello I have a 1993 Ford F-250 with a 7.3 nonturbo with a manual transmission. My tach has not worked since I bought it. When I start the truck up it works but then it slowly starts jumping around and then the needle goes all the way down. When I rev the engine up so far it comes up a little but no where near where it needs to be. Do I need a new tach sensor? I tried the one off my 1993 f-250 7.3 with a turbo manual transmission it threaded in but the plug would not plugin to the plug in the truck. Are the plugs different for the 7.3s with a turbo?
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Senior User
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They look the same. Maybe one of the prongs are a little off and not lining up right. Will try again tomorrow.
Lead Driver
Joined: Oct 2003
Posts: 8,476
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From: Madison, WI
If you determine the connectors really are different, just splice in the connector from the faulty sensor. I don't think polarity even matters. Make sure to insulate the splices well, as stray signals can throw off the signal to the tach.
But it's more likely just a case of a bent or misaligned terminal.
But it's more likely just a case of a bent or misaligned terminal.
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Senior User
Joined: Apr 2017
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If you determine the connectors really are different, just splice in the connector from the faulty sensor. I don't think polarity even matters. Make sure to insulate the splices well, as stray signals can throw off the signal to the tach.
But it's more likely just a case of a bent or misaligned terminal.
But it's more likely just a case of a bent or misaligned terminal.
Logistics Pro
Joined: Apr 2005
Posts: 4,221
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These tach sensors are so simple, often problems can be cured by removing the sensor and cleaning up the business end and reinstall. They pick up a lot of debris over the years (I believe they are magnetic?) and cleaning is many times the cure.
There's a couple of links in the FAQ to some simple ideas of making a new sensor, but like said above, you can just splice on the proper connector.
There's a couple of links in the FAQ to some simple ideas of making a new sensor, but like said above, you can just splice on the proper connector.
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Senior User
Joined: Apr 2017
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These tach sensors are so simple, often problems can be cured by removing the sensor and cleaning up the business end and reinstall. They pick up a lot of debris over the years (I believe they are magnetic?) and cleaning is many times the cure.
There's a couple of links in the FAQ to some simple ideas of making a new sensor, but like said above, you can just splice on the proper connector.
There's a couple of links in the FAQ to some simple ideas of making a new sensor, but like said above, you can just splice on the proper connector.
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Fleet Mechanic
Joined: Sep 2016
Posts: 1,519
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From: Nevada
There is a few threads on a cheap fix instead of buying the pricy Ford dealer sensor.
Here are some listed on flea bag. and a few threads
https://www.ford-trucks.com/forums/1...placement.html
https://www.ford-trucks.com/forums/1...er-sender.html
Honeywell Variable Reluctance Speed Sensor | eBay
Hope this helps, not sure if this is what you are working on.
Charlie
Here are some listed on flea bag. and a few threads
https://www.ford-trucks.com/forums/1...placement.html
https://www.ford-trucks.com/forums/1...er-sender.html
Honeywell Variable Reluctance Speed Sensor | eBay
Hope this helps, not sure if this is what you are working on.
Charlie
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