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Author
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Topic: Autometer tach going crazy
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kcode
Gearhead Posts: 3029
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99
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posted 08-12-2002 10:52 PM
   
A couple of months ago I put a new Mallory 6AL digital ignition on my coupe. It has an individual tach feed wire and everything worked fine. Tonight I drive the car to our weekly cruise in and the tach needle goes crazy on acceleration, if you level off at any rpm it works fine and steady. Give it any gas, even just alittle and the needle starts bouncing down to zero and back up. Almost like it is working backwards. Any suggestions, or time to replace the tach? I haven't had a chance to check the ground wires yet. Mike
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 08-12-2002 11:15 PM
Mike,Check the wire connections before you throw the tach out.  SteveW
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DidgeyTrucker
Gearhead Posts: 1190
From: Greenbrier, TN USA
Registered: Oct 99
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posted 08-23-2002 12:12 AM
Mike, do you mean MSD 6AL? The MSD Website:http://www.msdignition.com/ has some info on adapters needed to filter out odd electrical signals for tachs. Tracy [This message has been edited by DidgeyTrucker (edited 08-23-2002).]
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kcode
Gearhead Posts: 3029
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99
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posted 08-23-2002 01:06 PM
Tracy,
Nope, it a Mallory VI AL digital with rev limiter. Its relatively now on the market.I talked to their tech, they said it should not need a filter if it worked prior. They did say that their dedicated tach pickup could have a problem and instructed me on another pickup point. Gotta finish a cam swap before I can find out if it will work. At the rate I'm going I'll be breaking in a new cam on the way to Charlotte. Mike
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ZEATER
Gearhead Posts: 173
From: Mount Pleasant,IA,USA
Registered: Aug 2001
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posted 08-23-2002 02:47 PM
Had exact same problem at the track. The vibrations loosened the wire lead to the tach pickup. If the light on the tach still works but the needle bounces it is the tach pickup. If the light flickers it is more likely ground wire.
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