AC will not turn on with switch Speedo has not current to the sensor on the tran

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The AC has been charged and works when current is direct to the compressor but will not turn on with the ac switch, all components have been replaced, low psi switch is new. Speedo no work , no current at the sensor on the trans, removed engine wiring harness and inspected, all wires are good, all gauges work in the instrument cluster.