Hi to the auto electrician on hear I am afraid I am not one

.
So today I tried to fix my temp gauge I fitted a new brickwerks sensor in the engine block with finger x

but no good.
so I have dismantled the clocks taken the gauge out and put 12 V across it and the needle moves

so must be the blue sheet or the wires from the engine bay I guess

. is there a way to get the gauge to work with a new wire somehow? Any help from this amazing resource would be great Iam a long time owner but useless when it comes to electric

Many thanks in advance Danny.