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Re: Tic toc tach accuracy
[Re: denfireguy]
#1743441
02/02/15 05:33 PM
02/02/15 05:33 PM
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Joined: Jan 2003
Posts: 5,447
So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,447
So Cal
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Quote:
There is some confusion in that thread and it stems from the different types of electronic ignitions.
Mopars ignition system using the black box, orange box, chrome box, etc. uses a reluctor to replace point signaling and a large transistor switch to ground the coil to start the spark sequence. As a result, the switching voltages are the same as the old points system so there is no difference in tach signals.
Incorrect...
An OE Mopar tach (up to 71) will not read accurately with a Mopar electronic ignition, electronic distributor w/orange, chrome or gold box. The tach will indicate some RPM level but it is not accurate.
Regarding other aftermarket systems, Mallory, Pertronix, MSD U better check with the respective manufacturer about compatibility with the various tachs be it OE or aftermarket.. As some external dongle adapter may be required.
Just my $0.02.. 
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