BooneRV6a

Hi My first time here....needing some help with a vm1000 EMS. I have replaced the internal battery, but still can't rely on it to work. The display will work fine on leg, next it has only half the EGT CHT work, or the MP jumps around I am at my wits end who do I get in touch with to help me figure it out..only has 180 hrs on it.