Author Topic: How to test Tachs 67/68 Ford Mustang and Shelby?  (Read 1404 times)

Kent

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How to test Tachs 67/68 Ford Mustang and Shelby?
« on: November 03, 2022, 03:59:51 PM »
Iīm still thinking about how I can test my tachs here. I have a 65 Mustang here with no tach and would like to use this engine as the bench. So would it be ok to take a 1.5 ohm ballast resistor between and put it in line with the ignition switch to coil +

I read on some other forums that some people don't use a ballast resistor and only put the tach in line from ignition switch to coil +

Is there maybe a drawing or something how to do it right, thanks...
« Last Edit: November 03, 2022, 04:02:20 PM by Kent »
SAAC Member from Germany and Owner of a unrestored 1967 Shelby GT500, 1968 1/2 Cobra Jetīs and some nice Mustang Fastbackīs 67/68

67350#1242

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Re: How to test Tachs 67/68 Ford Mustang and Shelby?
« Reply #1 on: November 03, 2022, 08:02:02 PM »
Even non tach cars have the resistor wire in line from ignition to coil.  You should be safe putting the tach in series with that circuit. 
67 GT350  SJ 02/01/67  Gray 4spd A/C
67 Coupe  SJ 11/16/66  White Auto A/C PDB

67 GT350

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Re: How to test Tachs 67/68 Ford Mustang and Shelby?
« Reply #2 on: November 03, 2022, 08:32:15 PM »
I have a diagram from Phil Severance for the Shelby tach for a 66, would you like that?
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Kent

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Re: How to test Tachs 67/68 Ford Mustang and Shelby?
« Reply #3 on: November 07, 2022, 04:31:13 PM »
I think that could help, you have my e mail from last week I think, thank you.
SAAC Member from Germany and Owner of a unrestored 1967 Shelby GT500, 1968 1/2 Cobra Jetīs and some nice Mustang Fastbackīs 67/68

67 GT350

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Re: How to test Tachs 67/68 Ford Mustang and Shelby?
« Reply #4 on: November 08, 2022, 10:33:13 AM »
Hope this helps
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