Dry Electrical Joint

Looking some confirmation. I have a set of Mk 2 RS guages that seems to have a dry joint (or they are earthing out) - I'm diagnosing that on the following - when you flick the indicator switch, the hazard lights appear on the dash, but the 1 indicator works on the car.
Swap the RS guages to a spare that I have and the problem isn't there (therefore the problem should be in the dash).
Who could fix/test this and any idea on a ballpark figure (would it be cheaper to look for another set of guages)
Thanks
Swap the RS guages to a spare that I have and the problem isn't there (therefore the problem should be in the dash).
Who could fix/test this and any idea on a ballpark figure (would it be cheaper to look for another set of guages)
Thanks