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10-16-2012, 10:19 AM
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CC Member
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Join Date: Apr 2012
Location: Epharta,
PA
Cobra Make, Engine: year 2000 SPF 351
Posts: 68
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Not Ranked
Msd box ?
I have been told that MSD ignition boxes burn out RPM tachs any input ? I am putting a new L6 MSD box in, thank you Livnn.
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10-16-2012, 11:19 AM
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Stolen Avitar
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Join Date: Oct 2004
Location: Brunswick,
GA
Cobra Make, Engine: BDR 1311 428PI
Posts: 3,044
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Not Ranked
If you mean RPM "brand" tachs them I'm afraid that I've never heard of them. If you mean tachometers in general then the answer is no, they won't burn out your tach when installed correctly. I've used them with a variety of cars and tachs for the better part of 30 years and never had a tach problem come from an MSD box.
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10-16-2012, 12:08 PM
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CC Member
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Join Date: Dec 2001
Location: Castalia,
Oh
Cobra Make, Engine: EM cobra, 450 inch sbc running a best ET of 9.14..so far..ALL MOTOR...approx 800 horse.............ERA with 482 FE..All Aluminum Engine
Posts: 1,395
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Not Ranked
x2....
__________________
Jack
XSSIVE .....
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10-16-2012, 03:32 PM
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CC Member
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Join Date: Sep 2003
Location: San Jose,
Ca
Cobra Make, Engine: SPF #1436 514
Posts: 1,489
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Not Ranked
40,000 miles on mine with the original RPM gauge and second MSD 6AL Box.
Scott
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10-17-2012, 07:33 AM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,406
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Not Ranked
From what I’ve seen, the majority of the failures with MSD boxes (or any others for that matter) are usually related to installation issues, which include wiring connectors, electrical system voltage spikes, grounding issues, and condensation. Bad ignition switchs also contribute to ignition box failures.
__________________
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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10-17-2012, 09:15 AM
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CC Member
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Join Date: Apr 2012
Location: Epharta,
PA
Cobra Make, Engine: year 2000 SPF 351
Posts: 68
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Not Ranked
Thank you again for your help, the new MSD box will be going in this weekend.
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10-17-2012, 12:35 PM
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CC Member
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Join Date: May 2011
Location: Hillsboro,
OR
Cobra Make, Engine: Superformance Cobra Chassis #408, 427FE, TKO600
Posts: 94
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Not Ranked
Adapter....
Not sure about anyone else, but my installation using a MSD-6 Digital box uses a tach adapter (MSD Part number 8920) to drive the Smiths gauge. Works fine, and no issues.
The digital MSD box even does the gauge "Sweep" on start-up (will show you where the limiter is set), and that works fine through the adapter. I believe it's a 4 wire install (power/ground/tach in/tach out).
Hope that helps.
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