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Tach wiring with msd tach output wire
#2490629
05/01/18 08:58 PM
05/01/18 08:58 PM
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Joined: Jun 2007
Posts: 1,180 clarks summit pa
73cuda340
OP
super stock
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OP
super stock
Joined: Jun 2007
Posts: 1,180
clarks summit pa
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Has anybody used the gray tach output wire from an msd box to hookup their tach, or do you just use a wire from the negative side of the coil? I'm hooking up the rallye dash in my car and I had the tach converted to work with an msd ignition and the label on the tach says to use the negative coil wire. Wouldn't the gray wire from the msd box be the same signal wire as the negative coil wire? I already have the msd wire behind the dash and I would rather use that if it'll work instead of having to run an additional wire through the firewall to the coil.
1973 Cuda 528 all aluminum Hemi, 4 speed, 3.23 Sure-Grip,
(JA5) Silver Frost Metallic
1973 Challenger Rallye 340
1985 W150 Power Ram prospector
1986 Camaro IROC-Z 305 tpi
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Re: Tach wiring with msd tach output wire
[Re: 73cuda340]
#2490685
05/01/18 11:37 PM
05/01/18 11:37 PM
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Joined: Oct 2011
Posts: 290 Dayton, WA
wesgtx440
enthusiast
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enthusiast
Joined: Oct 2011
Posts: 290
Dayton, WA
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I used the gray wire from the msd box.
68 Charger R/T 440 auto
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Re: Tach wiring with msd tach output wire
[Re: earlymopar]
#2491216
05/03/18 12:15 AM
05/03/18 12:15 AM
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Joined: Jun 2007
Posts: 1,180 clarks summit pa
73cuda340
OP
super stock
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OP
super stock
Joined: Jun 2007
Posts: 1,180
clarks summit pa
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My car has the rallye dash with the stock internals converted to work with an msd ignition. I just ran a new wire to the coil just to be safe.
1973 Cuda 528 all aluminum Hemi, 4 speed, 3.23 Sure-Grip,
(JA5) Silver Frost Metallic
1973 Challenger Rallye 340
1985 W150 Power Ram prospector
1986 Camaro IROC-Z 305 tpi
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Re: Tach wiring with msd tach output wire
[Re: Dave Hall]
#2491389
05/03/18 11:47 AM
05/03/18 11:47 AM
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Joined: Jun 2007
Posts: 1,180 clarks summit pa
73cuda340
OP
super stock
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OP
super stock
Joined: Jun 2007
Posts: 1,180
clarks summit pa
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If you are using an MSD ignition and your tach is calibrated for that use, use the MSD output. No wires other than the MSD coil wires to the coil. I have the tach wired to the coil now. Do you think there will be any issues wired this way? The guy who converted the tach knew I had an msd setup and he said to use the negative side of the coil.
1973 Cuda 528 all aluminum Hemi, 4 speed, 3.23 Sure-Grip,
(JA5) Silver Frost Metallic
1973 Challenger Rallye 340
1985 W150 Power Ram prospector
1986 Camaro IROC-Z 305 tpi
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Re: Tach wiring with msd tach output wire
[Re: Twostick]
#2491502
05/03/18 02:35 PM
05/03/18 02:35 PM
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Joined: Jun 2007
Posts: 1,180 clarks summit pa
73cuda340
OP
super stock
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OP
super stock
Joined: Jun 2007
Posts: 1,180
clarks summit pa
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OK thanks. Good thing I didn't start the car.
1973 Cuda 528 all aluminum Hemi, 4 speed, 3.23 Sure-Grip,
(JA5) Silver Frost Metallic
1973 Challenger Rallye 340
1985 W150 Power Ram prospector
1986 Camaro IROC-Z 305 tpi
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