Got a Harlan switch with a kit that was purchased through the iansw GD.

Hooked it up as per instructions, but it still doesn't work. Red to power, black to ground, green to tach line from ECU and white to relay.

The LED on the switch is off at idle, and illuminated once passed the desired RPM, but the potential across the white wire remains the same...9.3V. It's 9.3 V regardless of RPM. I installed a diode inline with the white wire as advised, and that did nothing. LED still turns on and off, potential still stays the same.

Any thoughts?