The grey harness on the HFS-3 has the wires you are looking for:
Black: Map SW0 ......... Relay N/C
White: Map SW1 (DDS3v8 MSW-1) ........... Relay COMM
Brown: Map SW2 (DDS3v8 MSW-2) ........ Relay N/O
(Relay energises immediate when gauge is switch on)
If you are using a voltage based map switch on the hydra, the HFS-3 has a dedicated wire for that, it can output 0, 5v or 8V. It can also be inverted.
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Richard L
aquamist technical support
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