Factory Electronic Tachometer Issue

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12many

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I’ve got a factory tach correctly wired up but stays stuck as shown. Got it in a box of spares for my 78 D-150, hoped by booking it up it would drop back down and function. No go. Anyone know of people offering services that cab fix these things??

7582F5A3-D90B-494B-9767-973E4413B1A9.jpeg
 
There are upgraded electronic boards with instructions available. They are different, what year?
 
It’s a Chrysler tach with (part number) specifically for the late 70’s Dodge pickups. As mentioned in my original post: 78 D-150
 
That might be a tough one. Those meters are delicate, and obviously obsolete.
 
email rt-eng.com
They are helpful and have an interest in upgrading these kind of things.
 
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