Golf Mk2 2ltr 16VT/megasquirt v3

brown went to eci and yellow to the guage, it worked b4, as i was see'ing the readings on ms, i even datalogged in megatune with the readings, but now theres nothing, strange, i did a free air calibration but that didnt work, and i cant get the led calibration light working like a did b4, so something isnt right me thinks

when you turn it on is it giving a fault code?
The fault codes are indicated by the LEd.
Is the LED not working at all then ?