B&G SEN-SPEED-H sensor connections???

[wingmanII]

Hi
I have a B & G Hydra 2000 system from 2007
I have now changed the log sensor when the temperature sensor in the log was broken and showed completely the wrong temperature.
The log sensor was connected via a junction box and through the whole boat to B & G main unit.
The old cable from the log sensor consisted of 7 wires + ground
The new cable from the log consists of 6 wires + ground.
There are clear instructions on the new log that the old yellow/red cable to be connected to the new brown.
The old sensor:
ST850-INSR
SEN-SPEED-H
PN: 31-590-7-71
REV: 1
From 07/07

The new sensor:
ST850-INSR
SEN-SPEED-H
PN: 31-590-23-01
Rev: 2
From: 04/13


That means:
Old cable > new cable
yellow / red > brown
black> black
white > white
green > green
red > red
brown >?
Grey >?
? > blue


The temperature sensor is working but not the speed log!
Hope you can help me, I have contacted B & G in England but no answer?


Regards
/ Martin</SPAN>