Mobius oil and gas gauge not working

I've been having some trouble with my oil and gas gauge on my Mobius. I've taken it in to get it worked on and they said they fixed the problem but the oil gauge still sits below zero flickering back and forth and the gas gauge stays a 3/4 tank. I'm not going to take it back to get it worked on by the same dealership again because of the lack of good service and they are not a Moomba dealer. I would have to trailor the boat out of state for the closest dealership. I have called moomba about this but they have referred me to other people, who referred me to yet someone else and never got my questions answered. I was wondering if anybody here could help me with fixing the gauges. thanks.