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You need to check for a signal at the back of the instrument panel, yellow/green wire in the 20 pin white connector. If no signal there then the 13 pin black connector behind the right fairing pocket.
 

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You need to check for a signal at the back of the instrument panel, yellow/green wire in the 20 pin white connector. If no signal there then the 13 pin black connector behind the right fairing pocket.
To add to what Dave said at the rear of the tach there should be a yellow and green wire screwed to the rear of the tach. Unscrew annd disconnect those two wires. Use a good high end meter only as the yellow wire goes to the ECM and you should have a high impedance meter to protect the ECM. If you have a meter that measures frequency, dwell or DC volts low range will work. With the meter wired with the red probe to yellow and the black wire to the green. Now start the engine. the reading is not important but as you accelerate the engine the meter must respond. If it responds the signal is present and the meter is bad. If there is no signal take the black meter probe off the green wire and ground it directly to the bike ground and set the meter to ohms. There should be virtually no resistance if the ground is good.
If you have a ground and no signal the problem must be either the ECM 9 not likely) or the wiring from the ECM to the tach. I would go find the yellow wire at the ECM and check for a signal there by putting the red probe on the yellow and ground the black probe to the bike. Accelerating the bike should change the meter readings. If you are sure you sre testing the right wire at the ECM and no signal comes from the ECM then the ECM must be bad. Again, this is unlikely. If you have a signal at the ECM but not at the meter head the issue is in the wiring and refer back to Dave's post. Hope this helps. :)
 

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The tach just stopped working on my 2000 Goldwing SE
Did it completely quit working? Or will it start working 2 - 3 minutes after starting the engine?

Your Tach only has two wires (ground and signal from the ECM).

I would first check for a signal at the C72 Black “13-pin” connector behind the right fairing pocket.

Easier than removing the instrument panel.

Oh....And it will be a "yellow/blue" wire.....not a.... "yellow/green" wire as indicated in post # 2.....!!!!

If you narrow it down to the Tach unit, any Tach from 1990 - 2000 will work. But the 1998 - 1999 has a "white" background.
 
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