Tach signal wire to Neg on coil?? - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
 
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#1 Old 02-18-2006, 12:10 PM
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Tach signal wire to Neg on coil??

Anyone know were I need to hook up my signal wire fo my tach?

91 4X4 Dakota on 31" mudders
87 2 wd Dakota, 3.9, auto (soon to get 360/727)

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#2 Old 02-19-2006, 10:58 PM
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Nobody knows?

91 4X4 Dakota on 31" mudders
87 2 wd Dakota, 3.9, auto (soon to get 360/727)

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#3 Old 02-21-2006, 01:47 AM
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87 or 91? Is this a new tach and what brand? Have you tried their website or Tech Support phone line?
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#4 Old 02-21-2006, 10:23 AM
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91 Dak V6 TBI

The tach is used (unknown brand) but worked fine on my 76 Buick with HEI before I took it out of the car.

I just can't find out where to hook it up. Someone said the neg on the coil? Sound right.

91 4X4 Dakota on 31" mudders
87 2 wd Dakota, 3.9, auto (soon to get 360/727)

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#5 Old 02-21-2006, 01:16 PM
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Yes. That's correct. The positive on the coil should come from a switched positive voltage off the ignition (or from the computer) and the negative comes from the distributor (or from the computer). Basically, your tach is measuring how many times a spark is thrown in a matter of a minute. The output will change depending upon whether the tach thinks it's connected to a V8 or a V6 or a 4cyl. engine.

So, as long as your 76 Buick had a V6, then everything will work correctly. However, if your Buick had a V8, then you will need to find a brand name and find instructions on the Web. There will be an additional change in wiring with the unit if the number of cylinders changes. Usually, it's a matter of cutting the "green" wire if it's one thing or leaving it connected if it's another. The color may change and the specifics may differ slightly. However, I can't think of an instance where an easy wiring change would not be required.

1950 Dodge Panel Van (360 C.I. / 5.9L Magnum V8 from 2002 Dodge Ram)
1966 Dodge Charger (318 C.I. Poly-head V8)
1977 MGB (3.5L V6 from a 2005 Dodge Magnum)
2000 Dodge Ram (5.9L Magnum V8)
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#6 Old 02-22-2006, 01:52 AM
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Hey, thanks a lot for the tips. The tach has a switch on it so I just switched it to V6 from V8. It work fine now, I just need to get it mounted properly but thats easy. It's a 2" tach so it will fit fine on the column. I can't believe they made a manual truck without a tach!

Anyway BDL, your truck is really cool. Way to go!

91 4X4 Dakota on 31" mudders
87 2 wd Dakota, 3.9, auto (soon to get 360/727)

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