Tach install ?????

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TripleL

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I got this old tach the other day and would like to know if anyone knows anything about one. There is a red,black, and white wire what goes where to test it? Thanks

IMG_20200320_090134.jpg
 
Lol well we can do another swap... .$$ for tail lights lol:poke:
That is a cool tach. I bet the white is lights, red is power(from coil possibly)black is ground. Just a guess
Thanks but I don't even have a 69 just part of a swap I did thanks
 
get out your trusty Ohm meter and go do the following:

upload_2020-3-21_9-1-58.png


I know it seems like you are doing the same thing by doing each test twice but with the leads reversed, but I'm looking for diode like devices in the system


MY guess
Red = power +12V
Black = neg terminal on the coil
White = light
Housing = ground for light.

The more I dig the more I think you are missing a wire (green) or the unit does not have a light and the wiring would be something like this:

Red = power +12V
Black = ground
White = neg terminal on the coil

OR

Red = power +12V
Black = neg terminal on the coil
White = ground



ALSO if you can open it up and look where each wire goes that would help too and PHOTOS


this is for Autometer

upload_2020-3-21_9-29-18.png



Now the plot thickens ( there are current driven tachs... who knew)

from: https://shop.e3sparkplugs.com/images/pdf/5927253042154.pdf

"...There are two styles of tachometers, Voltage Triggered and Current Triggered. The wiring for both of these types of tachometers is different. First, you must determine what type of tachometer you have in your vehicle. Once you have done that follow the wiring instructions for your tach type.

Voltage Triggered: If the tachometer trigger wire was originally connected to the coil negative terminal, then the tachometer is Voltage Triggered.

Current Triggered: If the tachometer trigger wire was originally connected to the coil positive terminal, then the tachometer is Current Triggered.

Wiring the Tach Adapter harness for a Voltage Trigger tachometer; When wiring any DiamondFIRE component we recommend Weatherpack connectors. If you are not using Weatherpack connectors and prefer making wire to wire connections then we recommend soldering the wires together and applying an appropriate heat shrink. Step 1: Connect the Red wire to a switched 12 volt positive source Step 2: Connect the Black wire to ground Step 3: Connect the White wire to the Gray wire coming from the DiamondFIRE 6CDI Ignition Control Box (p/n E3.1440) Step 4: Connect the Violet wire to tachometer input trigger

Wiring the Tach Adapter harness for a Current Trigger tachometer; Step 1: Connect the Red wire to the tachometer input trigger Step 2: Connect the Black wire to ground Step 3: Connect the White wire to the Gray wire coming from the DiamondFIRE 6CDI Ignition Control Box (p/n E3.1440) Note: in this application the Violet wire is not used!

Note: Never install any tachometer input wire to either of the positive or negative coil terminals when using a CD Ignition Control box...."
 
Last edited:
get out your trusty Ohm meter and go do the following:

View attachment 1715490783

I know it seems like you are doing the same thing by doing each test twice but with the leads reversed, but I'm looking for diode like devices in the system


MY guess
Red = power +12V
Black = neg terminal on the coil
White = light
Housing = ground for light.

The more I dig the more I think you are missing a wire (green) or the unit does not have a light and the wiring would be something like this:

Red = power +12V
Black = ground
White = neg terminal on the coil

OR

Red = power +12V
Black = neg terminal on the coil
White = ground



ALSO if you can open it up and look where each wire goes that would help too and PHOTOS


this is for Autometer

View attachment 1715490793


Now the plot thickens ( there are current driven tachs... who knew)

from: https://shop.e3sparkplugs.com/images/pdf/5927253042154.pdf

"...There are two styles of tachometers, Voltage Triggered and Current Triggered. The wiring for both of these types of tachometers is different. First, you must determine what type of tachometer you have in your vehicle. Once you have done that follow the wiring instructions for your tach type.

Voltage Triggered: If the tachometer trigger wire was originally connected to the coil negative terminal, then the tachometer is Voltage Triggered.

Current Triggered: If the tachometer trigger wire was originally connected to the coil positive terminal, then the tachometer is Current Triggered.

Wiring the Tach Adapter harness for a Voltage Trigger tachometer; When wiring any DiamondFIRE component we recommend Weatherpack connectors. If you are not using Weatherpack connectors and prefer making wire to wire connections then we recommend soldering the wires together and applying an appropriate heat shrink. Step 1: Connect the Red wire to a switched 12 volt positive source Step 2: Connect the Black wire to ground Step 3: Connect the White wire to the Gray wire coming from the DiamondFIRE 6CDI Ignition Control Box (p/n E3.1440) Step 4: Connect the Violet wire to tachometer input trigger

Wiring the Tach Adapter harness for a Current Trigger tachometer; Step 1: Connect the Red wire to the tachometer input trigger Step 2: Connect the Black wire to ground Step 3: Connect the White wire to the Gray wire coming from the DiamondFIRE 6CDI Ignition Control Box (p/n E3.1440) Note: in this application the Violet wire is not used!

Note: Never install any tachometer input wire to either of the positive or negative coil terminals when using a CD Ignition Control box...."
Thanks I'll jump on that shortly and report back! Gotta dry out first cold, wet , miserable currently
 
Lol well we can do another swap... .$$ for tail lights lol:poke:
That is a cool tach. I bet the white is lights, red is power(from coil possibly)black is ground. Just a guess
If you want them pm me. I thought you were selling out and boating
 
It may not have a light or the light may be on continously. In which case the white wire may be the tach signal .
Try ground the black wire and briefly touchin the white red to positive to see if it lights up.
Then touch the white to positive to check for light...
 
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