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Great, those screenshots are very helpful. Looks like both senders are in series, one end connected to ground (31) through unknown resistance and the other to +12V (15) through another unknown resistance. You could figure out the resistances by putting one 500ohm resistor in place of the series senders. Then measure voltages on low side of 500ohm (ref gnd) and high side of 500ohm. Then it's ohms law since you know current through 500ohm and difference in high/low side measurements to gnd &+12V.
So is each sender 20-220ohm meaning in series you'd need to create one 40-440 ohm resistance to interface to the cluster ?
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