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Strength is not an issue. You can drive a Yamaha tachometer from a 120 volt, 60 Hz wall outlet. Or from a 20 volt AC source. Have done it many a time.
Do you have a multi meter with a frequency setting? You can measure the frequency on the green wire to the tachometer
Someone could have very well changed your sender from the three wire configuration to the two wire configuration. In which case life is simpler. But now that I think about it, a 2003 F90 might have come with a two wire sender. I am getting old.
The issue now is to make sure that whatever trim gauge you use is compatible with the resistance of the sender.
Do you have a multi meter with a frequency setting? You can measure the frequency on the green wire to the tachometer
Someone could have very well changed your sender from the three wire configuration to the two wire configuration. In which case life is simpler. But now that I think about it, a 2003 F90 might have come with a two wire sender. I am getting old.
The issue now is to make sure that whatever trim gauge you use is compatible with the resistance of the sender.
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