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Old May 17th, 2008, 09:17 PM
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Default 12 volt tach, 24 volt system

I have a 12 volt tach that I use on my engine run in stand. I'm thinking that once I am done with the engine breaking for my 914, I will put that tach on the M715.

Will running the wire to the negative coil (as per usual) work for a 12 volt tach, or will it overload somehow. I don't THINK it will, but I am horrible with electric stuff.

Zach
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Old May 19th, 2008, 12:12 PM
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Quote:
Originally Posted by vacca rabite View Post
Will running the wire to the negative coil (as per usual) work for a 12 volt tach, or will it overload somehow. I don't THINK it will, but I am horrible with electric stuff.

Zach
Most aftermarket tachometers have 4 wires. The green is usually negative coil connection, the red is switched battery +, the black in ground and the white for the light. All the connections work the same with 24 volts and the bulb can be changed, but, you still have to run the positive lead of the tach to the ignition switch lead, so it would have to be 12 volts, or a 24 volt tachometer.
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