The harness diagram below shows the 4 pin wiring option for 3 wire hall effect sender. The way I read this, the black wire from the sender connects to the Tan/Black from the harness, the white (sender signal) connects to the tan/white from the harness, and the red (power for sender) connects to the red/white from the harness. So I take it this would mean the tan/black from the 4 pin harness is grounded through the black from the 6 pin harness (both of these plug into the back of the speedometer) and the red/white from the 4 pin harness will provide the 8V+ to power the sender signal. I'm guessing this power comes from the 12v power that the purple wire from the 6 pin harness is tied into? I've asked NVU's customer service several times and called and left messages, nothing. I don't think I'd recommend them to anyone.
Thanks,
Thanks,