Author Topic: tach working some times but not reading correctly  (Read 1231 times)

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Offline shredeagle

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tach working some times but not reading correctly
« on: December 18, 2012, 05:40:38 PM »
is this something that can be repaired? 81 4cyl

Offline WoodenBirdOfPrey

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Re: tach working some times but not reading correctly
« Reply #1 on: December 18, 2012, 06:53:39 PM »
The general consensus seems to be that the original AMC tachometers aren't very reliable due to the design.  Seems like replacing it with another one will just be a temporary solution until the next one fails too.  The by far cheapest and most stock-appearing option I've seen so far is fitting the factory in-dash tachometer for an early 90's I-6 Ford truck into the stock Eagle gauge cluster.  Vangremlin did this first and did a nice write up on it, check it out:

I replaced the digital clock in my Eagle with one of these and I love it.  It's an easy job to do with some basic fabrication skills (some cutting with a Dremel mostly) and a couple free hours.  It matches the factory cluster very nicely, only another Eagle owner would be likely to notice it isn't the original equipment one.  The big benefits of this over getting another factory Eagle tachometer is the Ford units seem to be pretty reliable in comparison, and they're very easy to find and cheap in salvage yards.
« Last Edit: December 18, 2012, 06:59:23 PM by WoodenBirdOfPrey »
87 Eagle Woody Wagon "Virginia" 4.2 Auto 174k

Offline eaglebeek

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Re: tach working some times but not reading correctly
« Reply #2 on: December 18, 2012, 11:47:05 PM »
@WoodenBird...shredeagle's bird has a 4-cyl and the Ford I-6 tach won't read right.

@shredeagle...Eagle tachs, like WoodenBird said, are prone to problems and are probably not worth much effort. The only answer I know of is an aftermarket tach. Do check for loose connections, a poor ground and broken wires, though, before you throw in the towel. :eagle:
1984 Eagle Wagon, 258, auto, 2.73 gears, daily driver
1983 Eagle Limited Wagon, new arrival from way up north
2000 Jeep Cherokee, 4.0, auto
2007 Hyundai Accent, radical downsize from minivan, wife's car and she loves it!

"The society which scorns excellence in plumbing as a humble activity and tolerates shoddiness in philosophy because it is an exalted activity will have neither good plumbing nor good philosophy: neither its pipes nor its theories will hold water."--John W. Gardner, in "Excellence: Can We Be Equal and Excellent Too?" (1961)
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Offline vangremlin

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Re: tach working some times but not reading correctly
« Reply #3 on: December 18, 2012, 11:48:47 PM »
Shredeagle sent me a PM and like eaglebeek said, he has a 4 cylinder, so I don't think the tachs I've been pulling will work with that.  I told him I would do a little research and see if there is anything else that might work for him.
1981 Kammback 258 - "Pepe"
1972 Gremlin X 304
1978 Gremlin 4 cyl 121 - sold
1964 TBird 390


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