Td5 in a 90 weird and wonderful problem

Put a td5 in my old 90, used a defender ecu with defender looms ect. Yesterday I finished the pipework and filled it up with coolant.. Went to turn it on and nothing. It was immobilised... Long story short I'd managed to join all 3 black wires for the bbus alarm to earth without realising. Now after getting it to start again the red immobiliser light stays on even when I use the plip fob to turn the imob off as shown. Doesn't really effect its use as its all working fine but the red imob light will do my head in when driving around. Any ideas? Only other thing I've done is run the low fuel wire from the 200tdi tank sender straight to the warning light on the instrument cluster as the def td5 low light has something to do with the dash clocks or so I recall reading once...
Before I did the wing wiring the red imob light would only Come on when the engine was actually immobilised.

I've also tried turning the imob off and back on in the as10 box with nanocom. Maybe I've upset it some how... Video to come
Thanks
Thanks

Also would someone be able to explain what happens inside the instrument panel as I see the black lines between the warning indicators and they go to a a but not sure what that actually means. Thanks

I read it as "A" being a lead with a plug on it, A47. If that is what you refer to in the photo you posted.

may help View attachment 200595