I have a 92 Hunter 33.5 and the separate temperature gauge (on my boat, its right below the starting panel starboard side) has gone haywire and reads overheated (240 degrees) when I know the boat is not - sometime it kicks back to normal so I know its the gauge thats gone bad. There is no mfg name shown and I assume its a stock gauge - I need to replace - does anyone know where or how to fnd these?