E body Rally dash tachometer
#927855
02/13/11 02:38 PM
02/13/11 02:38 PM
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Joined: Oct 2003
Posts: 2,403 WASHINGTON, PA
11secaarcuda
OP
top fuel
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OP
top fuel
Joined: Oct 2003
Posts: 2,403
WASHINGTON, PA
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How can I know if my factory tach is accurate? How accurate are they usually? Also, can the electronics be upgraded to work in conjunction with my MSD 6AL ignition? I have been using an Auto meter for the past 10 years, and I want to get back to a stock look, but make sure the factory tach is accurate.
67 Dart GT 340 4 speed 70 AAR Cuda 408 6 barrel 96 Indy Ram original owner 2011 Hemi Durango
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Re: E body Rally dash tachometer
[Re: 11secaarcuda]
#927861
02/13/11 06:00 PM
02/13/11 06:00 PM
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Joined: Mar 2007
Posts: 3,277 West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,277
West Coast, USA
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I tried the MSD tach adapter and my factory tach works....some of the time. It reads way higher other times. The cluster is well grounded. I have since had Redline gauges rebuild my cluster including replacing the tach internals with modern VDO internals. There is no need to use the tach adapter with this setup, which is vastly more accurate. Let me know if you want my slightly used adapter.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: E body Rally dash tachometer
[Re: 11secaarcuda]
#927866
02/15/11 02:18 PM
02/15/11 02:18 PM
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Joined: Jan 2007
Posts: 1,163 NORTHERN VA
THESHAKERPROJECT
super stock
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super stock
Joined: Jan 2007
Posts: 1,163
NORTHERN VA
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Quote:
How can I know if my factory tach is accurate? How accurate are they usually? Also, can the electronics be upgraded to work in conjunction with my MSD 6AL ignition? I have been using an Auto meter for the past 10 years, and I want to get back to a stock look, but make sure the factory tach is accurate.
I would bet most any mopar factory tach is WAY off. You can sent the tach to Redline gauge works and have the internals replaced with a modern ( think he uses VDO)tach keepin the OEM face and pointer. Did this on my Challenger and Charger.
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Re: E body Rally dash tachometer
[Re: 11secaarcuda]
#927867
02/15/11 02:26 PM
02/15/11 02:26 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
How can I know if my factory tach is accurate? How accurate are they usually?
My experience is they are WAAAAAY off... indicated my bone stock 340 'Cuda was turning close to 7000 RPM when it was probably hitting valve float more like 5800-6000.
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