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Author
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Topic: Tach Problem
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JAAZZY
Gearhead Posts: 745
From: Bay Area, CA
Registered: Apr 2001
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posted 10-08-2001 11:34 AM
  
Last week the tach in my 65 started bouncing at idle. I haven't noticed any other problems and can't figure it out. It bounces from 1300-2500 when I'm at idle. As soon as I start moving it returns to normal operation. Any ideas on what it could be? It is a Mallory unit that I've had for a long time. It wired in with all of my other gauges that seem to be working fine. Thanks.
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kcode
Gearhead Posts: 2456
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99
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posted 10-08-2001 01:05 PM
Jaazzy,
Check all of the wire connections, sounds like a loose wire. Could be inside a crimped terminal.  Mike
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JAAZZY
Gearhead Posts: 745
From: Bay Area, CA
Registered: Apr 2001
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posted 10-08-2001 01:21 PM
Yeah sure give me a few hours of work to do!  I have a sneaky suspicion it is a ground somewhere. I'm going to pull off the dash cluster and see if I can find a good ground under there. - Jas quote:
Originally posted by kcode:
Jaazzy,
Check all of the wire connections, sounds like a loose wire. Could be inside a crimped terminal. Mike
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JAAZZY
Gearhead Posts: 745
From: Bay Area, CA
Registered: Apr 2001
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posted 10-09-2001 02:02 PM
Well I grounded the tach to a new location and it seems to be better. It's bouncing less. I tried grounding it in the engine compartment but that didn't make it any better. I'm not sure if it was the ground or if it was just me moving all the wiring around. I think it might be the tach. It's worked fine for a long time and the wiring hasn't changed so I suspect that it might be getting ready to fail.
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Fastymz
Moderator Posts: 8931
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 10-09-2001 05:38 PM
Jaazzy Thats the same thing my 16 year old sun superII tach did.I replaced all the wires,but that did not help.I put in a new tach and it was fine using all the same wires and connections.So it may be time for a new tach,The auto meters with a shift light they are cool Ron------------------
65 Coupe with a stock 1969 351w, Edelbrock RPM intake,carter625cfm,shorty Hedmen hedders,Black Magic electric fan,stock C4,peg leg 8" 2:80,Boss 429 hood scoop,Cragers SS,Black primer or Black Satin finish.
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JAAZZY
Gearhead Posts: 745
From: Bay Area, CA
Registered: Apr 2001
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posted 10-09-2001 06:29 PM
But they sure aren't cheap!  Unless it starts acting more screwy than it is now I'm jut going to leave it alone. It's a little bouncy at idle but fine after that. If it gets worse I think I'll go for the Autometer tach with the internal shift light. I think I like the 3.75" size. quote:
Originally posted by Fastymz:
Jaazzy Thats the same thing my 16 year old sun superII tach did.I replaced all the wires,but that did not help.I put in a new tach and it was fine using all the same wires and connections.So it may be time for a new tach,The auto meters with a shift light they are cool Ron
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Fastymz
Moderator Posts: 8931
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 10-09-2001 07:59 PM
Jaazzy they are expensive,but they work great.I went for the Summit racing tach with the internal shift light, that I got from the cleance shelf at the Sparks NV store for $20.It works great, but if it gose out I'll go for the Auto meter large face and light.My brother inlaw as it and you go see that light from a mile away.After my tach started to bounce it was only about a mo, later that it was bouncing all the time. Ron------------------
65 Coupe with a stock 1969 351w, Edelbrock RPM intake,carter625cfm,shorty Hedmen hedders,Black Magic electric fan,stock C4,peg leg 8" 2:80,Boss 429 hood scoop,Cragers SS,Black primer or Black Satin finish.
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JAAZZY
Gearhead Posts: 745
From: Bay Area, CA
Registered: Apr 2001
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posted 10-09-2001 08:00 PM
In that case I'm saving $3 a day for the rest of the month!
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65_289
Gearhead Posts: 693
From:
Registered: Jul 2001
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posted 10-10-2001 12:12 AM
My first tach was a Autometer AutoGauge tach with internal shift light. It cost like $80. It didn't work quite right after a little while, and we were told it had some kind of internal short. Anyway, we got a 5" Monster Tach with the big-@ss external shift light, and it works great!!!Good ain't cheap, and cheap ain't good.....
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