Tachometer problem
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Joined: Oct 2010
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Tachometer problem
My rpm gauge hasn't worked since I bought the truck. (85 f250 6.9). The tach sensor wires were showing so I replaced the sensor. Now the rpms will go up but will not come back down. Haven't had a chance to dig deep yet. Just seein if anyone had a similar issue?
Lead Driver
Joined: Nov 2003
Posts: 6,900
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From: Campbell River, B.C.
I almost wonder if the shaft in the tach assembly itself is sticky from years of not moving.
Mine will not read above 2500 and sometimes sticks there if I take the engine much higher then that. In my case however I suspect an internal electrical fault with the tach itself. I'm not sure if its fixable and didn't have time to troubleshoot the PCB on the back of it.
Mine will not read above 2500 and sometimes sticks there if I take the engine much higher then that. In my case however I suspect an internal electrical fault with the tach itself. I'm not sure if its fixable and didn't have time to troubleshoot the PCB on the back of it.
Laughing Gas
Joined: Jun 2007
Posts: 1,106
Likes: 35
From: Virginia
1986 F350. My gage started working again after driving it for a while.
Here is the diagram link:
https://www.ford-trucks.com/forums/1...in-wiring.html
Here is the diagram link:
https://www.ford-trucks.com/forums/1...in-wiring.html
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andrew1
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
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Mar 7, 2011 08:50 PM
