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Author Topic:   Tach Problem
JAAZZY
Gearhead

Posts: 745
From: Bay Area, CA
Registered: Apr 2001

posted 10-08-2001 11:34 AM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote
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

posted 10-08-2001 01:05 PM     Click Here to See the Profile for kcode   Click Here to Email kcode     Edit/Delete Message   Reply w/Quote
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

posted 10-08-2001 01:21 PM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote
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

posted 10-09-2001 02:02 PM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote
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

posted 10-09-2001 05:38 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
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

posted 10-09-2001 06:29 PM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote

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

posted 10-09-2001 07:59 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
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

posted 10-09-2001 08:00 PM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote
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

posted 10-10-2001 12:12 AM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
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 [email protected] external shift light, and it works great!!!

Good ain't cheap, and cheap ain't good.....

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