boost gauge

[SurreyED30]

morning all

had a boost gauge in for about 3 months now, no issues at all.
yesterday I swapped from a column pod to a vent pod, now the gauge wont illuminate??
used the same clip ( a new one) to pair the grey illumination wire to the gauge red wire, ive earthed the black wire into the same place??
really banging my head against the wall with this one   

any help would be great

jake