Ok, time for an update.
I have been look through posts, and speaking to Kev (kjc300) and he suggested the diode method.


I have tried with temporary wiring tonight and it seems to work!
I will make this more perminant, fit everthing back and see how it goes

Thanks, Kev and others that have given your input, I wonder if this method will also correct my secs monitor? (from ecu outputs) I will try and report back!

Gav