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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 03-04-2012, 07:51 PM   #1
JpEg625
 
Join Date: Nov 2009
Vehicle: 1985 mustang gt
Location: Indiana
Posts: 14
Question Tachometer ?

Hey gear heads!!

i've got a 1985 mustang gt, 5.0 five speed car w/carb. I purchased a dash mount 5" tach. i've had major headaches getting this thing to function...

i've heard rumors that some tachs might not work with the mustangs ignition system??

Can anyone shine some light on how i can add an additional tach to my dash, wire it properly so that it will function..

right now it will function after you get to about 2500 rpm, but the shift light goes nuts most of the time.

sorry if this sounds like a stupid ?, but i'm done busting my chops on it, can you help?

thanks!
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Old 03-05-2012, 05:28 PM   #2
nitrous_bob
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where did you hook it to ? and do you have a MSD box ?
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Old 03-05-2012, 11:23 PM   #3
tinman
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Sounds like you need to check ground wire, black wire most of the time.
Get it to a good ground.....
If it's an 'Autometer' or 'Autogage' brand there has to be a fuse in the power wire 1.5 amp if I remember right.
If you have either of these tachs PM and I can get you complete instructions.......
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Old 03-08-2012, 06:00 PM   #4
JpEg625
 
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Quote:
Originally Posted by nitrous_bob View Post
where did you hook it to ? and do you have a MSD box ?
ran ground to the battery, perhaps i need to view the connection again. no msd, factory ignition, but i replaced the ignition box last year. i ran tach signal from that output on the box. power wire is on the coil??
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Old 03-08-2012, 06:02 PM   #5
JpEg625
 
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Vehicle: 1985 mustang gt
Location: Indiana
Posts: 14
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Quote:
Originally Posted by tinman View Post
Sounds like you need to check ground wire, black wire most of the time.
Get it to a good ground.....
If it's an 'Autometer' or 'Autogage' brand there has to be a fuse in the power wire 1.5 amp if I remember right.
If you have either of these tachs PM and I can get you complete instructions.......
ground ran to battery, i will check its connection.. power wire running off coil, and green tach signal is ran out of the ignition box, have also tried the coil. it is a cheaper tach, not an autometer, does have an inline fuse.
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Old 03-08-2012, 06:02 PM
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