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How to Connect Dwell Tach Meter

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Old 08-31-2011, 11:44 PM   #1
54greg
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Default How to Connect Dwell Tach Meter

My meter has 3 hookups. A red and black clips and a white clip.

Black to ground, red to negative coil and...........?
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Old 08-31-2011, 11:49 PM   #2
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My meter has 3 hookups. A red and black clips and a white clip.

Black to ground, red to negative coil and...........?
Red to battery positive, black to ground and white to negative side of the coil.
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Old 09-01-2011, 08:07 AM   #3
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Originally Posted by wombvette View Post
Red to battery positive, black to ground and white to negative side of the coil.

Just a simple question and not trying to be a smart a$$. Why the white wire at all??? My tach/dwell meter only has the black and red leads. Works just fine and has for over 30 years. What is the white wire for?
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Old 09-01-2011, 09:32 AM   #4
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Just a simple question and not trying to be a smart a$$. Why the white wire at all??? My tach/dwell meter only has the black and red leads. Works just fine and has for over 30 years. What is the white wire for?
Every one that I have ever used has power leads and a signal. How else is it to read the RPM or the dwell.
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Old 09-01-2011, 09:37 AM   #5
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Mine has just 2 wires and will read the dwell and tach
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Old 09-01-2011, 10:27 AM   #6
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Every one that I have ever used has power leads and a signal. How else is it to read the RPM or the dwell.
There are both two wire and three wire tach/dwell meters. I'm not sure but I think the two wire meters are later design circuitry and pick up their power off the ignition side of the coil.
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Old 09-01-2011, 10:31 AM   #7
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There are both two wire and three wire tach/dwell meters. I'm not sure but I think the two wire meters are later design circuitry and pick up their power off the ignition side of the coil.
Exactly!
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Old 09-01-2011, 11:11 AM   #8
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Mine has just 2 wires and will read the dwell and tach
I have two of them just like yours. Both are over 30 years old and still work perfectly. Never seen a 3 wire one. That would have me confused as well. I'd probably have to break out the instructions.

Jim
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Old 09-01-2011, 11:17 AM   #9
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It's good to have more than one dwell meter since sometimes they are inaccurate. I got my last one a Sun at a garage sale for $5....
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Old 09-01-2011, 11:17 AM   #10
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I have two of them just like yours. Both are over 30 years old and still work perfectly. Never seen a 3 wire one. That would have me confused as well. I'd probably have to break out the instructions.

Jim
OK, so I haven't bought one in over 40 years. Haven't paid any attention to the new ones.
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Old 09-01-2011, 11:24 AM   #11
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I bought mine 45 years ago, and it has two wires - one to ground, the other to the coil (-); they don't make them like this any more - chrome die-cast housing, and glass lens on the meter.
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Old 09-01-2011, 01:06 PM   #12
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Some analog meters back then were multi-function, tach, dwell, volts and ohms. So you needed the extra lead to read battery volts or resistance.
Joe
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Old 09-01-2011, 03:22 PM   #13
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Some analog meters back then were multi-function, tach, dwell, volts and ohms. So you needed the extra lead to read battery volts or resistance.
Joe
Yep, Thats the kind I have. You can check voltage and check point resistance.
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Old 09-01-2011, 04:06 PM   #14
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Yep, Thats the kind I have. You can check voltage and check point resistance.
Well, I've learned something here. I have two meters. Both have two leads coming out of the handle. One of them is a tach/dwell meter and it works fine. The other is a "Milton 1212" brand meter and you can check point resistance and voltage. That is, if the meter would work and it doesn't.

Looking a little closer, it looks like there is a hole in the handle for another lead to come out and it's missing!

Never thought about this until now.

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Old 09-01-2011, 09:29 PM   #15
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Thanks all

Wombvette- thank you
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