I have Cummins 6CTA mechanicals on my 2004 420DB and this season I have had an issue where the stbd engine oil pressure gauge at the helm will bounce. Sometimes it will register normal values, other times it will go to 0 and sit there a while before starting to work again. Obviously the first time this happened I quickly headed to the engine room, and the gauge at the engine was registering just fine. I monitored it while underway and the pressure seemed perfect. So i'm thinking it must be the gauge. It's a combo gauge with oil pressure, volts, temp, fuel level (see pict, not my boat but same gauge). Curious if others have had this issue and if anyone knows if this exact gauge can still be sourced? If not are there any direct replacements out there?