Rob,
The switched +ve feed to the Acewell should provide all the power you need for the brake lights & fuel gauges.
The wires you are connecting are switched earths.
From memory I think Gus's HB warning light, lights really dimmly when sidelights & dipped beam on, becoming brighter when on main beam.
I think you may need to connect the warning light to the output of the relay directly and not the light going to the dash.
I used an premier wiring loom so it was a bit easier to fit the Acewell.
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