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Discussion Starter · #1 ·
my dad and i just put in an msd 6al box in his 84 mustang and his tach stoped working. but we put a 6al in my 91 and everything worked fine any help would be great
 

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your tach

nykmad said:
my dad and i just put in an msd 6al box in his 84 mustang and his tach stoped working. but we put a 6al in my 91 and everything worked fine any help would be great
Have you tried a diffent tach driver 84 carb is diferent the then 91 efi. let me know
 

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Discussion Starter · #3 ·
what do you mean a tach driver
 

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The tach in the pre 87 cars require a tach adapter in order to run an MSD ignition. It is available from MSD.
 
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