OK, from the three data points you provided (chart?) I'm interpolating that at 59ohms, fans are turning on at 85 degrees which is roughly what the temp. gauge reads.

Replaced Dual pin sensor two weeks ago.

What concerns me is that when I disconnect the dual pin sensor, the fans shut off. In a prior post, you mentioned:

If there is an open circuit on the sensor or the wires going to it, the ACC panel defaults into High Fan.
An easy test for this is to unplug the sensor and bridge the connectors wires with a 1K ohm resistor. If that shuts down fan, the sensor is faulty. If not, then pull the relay and see if fan stops.

Thanks again,

RJ

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RJ
'92 500E
'75 Triumph TR 6