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The sender has a resistance of between about 1.5K stone cold & about 200 ohms at 100C so initially I used a 1K variable resistor across the sender wire & ground. Had the scope & the DMM connected across the sender & ground.
Has a similar pulse to the fuel gauge but the amplitude is much smaller. Also noticed that if I took the resistance too low, the amplitude fell to almost zero & the gauge suddenly dropped from max to minimum.
I have not tried a divider yet. Could do one with a 3K & a 33R. That would get me down to 15mV.
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