No sub tank anymore, but dash light remains on!!!

[NP99]

Hi Guys
When I had LPG installed they removed the sub tank and the dash light remains constantly on. Is there a quick fix?
Cheers

[threedogs]

When I had my Aux fitted I was talking to Kevin at Brown Davis about the guage not reading quite right.
ends up its negative off {empty}, Maybe it needs to be bridged, but wait for Yendor to confirm

[Yendor]

There should be Yellow wire with a Red trace in the connector that went to your old sub tank.

With some wire make up a little bridge strap and connect the Yellow wire with a Red trace to the Black wire in the same connector.

You will also need to disconnect the vehicle's battery for about half an hour.

This should turn the light out.