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 2Likes
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1
Post By jhv48
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1
Post By eschaider
04-07-2024, 06:46 PM
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CC Member
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Join Date: Mar 2020
Location: Ann Arbor,
MI
Cobra Make, Engine: Superformance MK III, 396 Windsor
Posts: 16
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Not Ranked
Tach is on, then off, then on, then off for good
I have Superformance #633 built in 1999. 351 Windson, stroker. 23,000 miles. It has an old style Smith Tach.
About 4 years ago the tach failed to work about 5% of the time. About 2 years ago it was up to 15% of the time. Late last year It went to 100% gone.
I looked for loose wires and checked all of the ground wires I could find to make sure they had good connections, but found no issues.
Do Smith tachs slowly go bad, or do I more likely have a wiring problem?
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04-08-2024, 08:58 AM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
When mine did that, it was a loose connection from the tach to the msd ignition box mounted in the passenger footbox.
__________________
Jim
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04-08-2024, 10:05 AM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,726
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Not Ranked
Actually, a broken tach is better than a working tach. When the tach is working, it clutters up the car and the driver's mind with additional data, most of which is superfluous but the driver wants to reconcile. As a result, his attention is diverted from driving the car to reconciling superfluous data with his then current driving obligations.
__________________
Help them do what they would have done if they had known what they could do.
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04-08-2024, 10:52 AM
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CC Member
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Join Date: Jan 2009
Location: Las Vegas,
NV
Cobra Make, Engine: Shelby CSX4005LA, Roush 427IR
Posts: 5,583
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Not Ranked
Unless you're racing and then the tach matters and the speedometer is irrelevant Which is why the tach is in front and the speedo off to the side.
__________________
Cheers,
Tony
CSX4005LA
Last edited by twobjshelbys; 04-08-2024 at 03:27 PM..
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04-08-2024, 01:42 PM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,726
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Not Ranked
Correcto mundo, Tony!
__________________
Help them do what they would have done if they had known what they could do.
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04-08-2024, 06:11 PM
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CC Member
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Join Date: Nov 2007
Location: Castro Valley,
ca
Cobra Make, Engine: 396ci 460hp SPF #1072-Titanium
Posts: 45
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Not Ranked
Check for lose wires connection
__________________
Drive it like you stole it!
The Road Snake.
Dennis, SPF #1072
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04-09-2024, 05:38 PM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,405
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Not Ranked
With a car of that vintage, you may also have a tach adapter under the dash.
Blas
__________________
Wiring Diagrams: SPF MKII, MKIII, GT40, CSX7000, CSX8000, Corvette Grand Sport, and Shelby Sebring, Bondurant & Cinema Tribute Cars.
Owner’s Manuals: SPF MKII, CSX7000, CSX8000, Sebring, Bondurant, Cinema Tribute Cars $ GT40’s..
Large, easy to read and trace schematics with part numbers, wire colors, wire gauge, fuses, and electrical upgrade information. Trouble-shooting and replacement part numbers for those roadside repair adventures.
SPFWiringDiagrams@Comcast.net
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