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Author Topic:   Autometer tach going crazy
kcode
Gearhead

Posts: 3029
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99

posted 08-12-2002 10:52 PM     Click Here to See the Profile for kcode   Click Here to Email kcode     Edit/Delete Message   Reply w/Quote
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

posted 08-12-2002 11:15 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
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

posted 08-23-2002 12:12 AM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
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

posted 08-23-2002 01:06 PM     Click Here to See the Profile for kcode   Click Here to Email kcode     Edit/Delete Message   Reply w/Quote
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

posted 08-23-2002 02:47 PM     Click Here to See the Profile for ZEATER   Click Here to Email ZEATER     Edit/Delete Message   Reply w/Quote
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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