Fuel gauge not working mk2 dash vr6 pump & wiring

my bad, you have the mk3 loom that goes with the tank.
As finite says the pinout at the fusebox is the same.
didn't mean to confuse things more.

try unplugging plug M from the fusebox, and the fuel pump plug and check for resistance end to end.

 

On the contrary, you made things clearer by posting that info

 

All sorted guys I decided to remove the plug from the back of the fusebox on the mk3 loom and there is 5 wires so I compared
It to my original plug which only has 3 wires ??

So I thought sod it I cut the plug off the mk3 loom at the tank end and joined the mk3 plug to my original loom colour for colour, plugged my original plug m into the fusebox which only has 3 wires
Boom it works just fine

Thanks for all your input chaps

 

On driver on mk3 loom just split large brown wire and cut small brown and blue wire. Rejoin large brown but include small brown and blue goint to tank.