Rev Counter Wiring on Cromie

[Ianb]

Hi Guys,
I'm trying to connect the rev counter on a cromie to a Nissan engine and I have one wire on the nissan loom which i guess is "signal" and a plug with 3 wires coming down from the clocks on the cromie. My guess is the cromie wiring has live / earth and the 3rd wires the signal one. Does anyone know for sure ? also do you know which wires which on the cromie plug ? Thanks

[Grrrmachine]

On the three-pin plug from your chromie that connects by the ECU, you only need the black wire for the tacho (pin 1), while pin 3 (white) is the econometer.

[Ianb]

Thanks Grr, Much appreciated