DC DIGITAL METERS (BLUE SEA SYSTEMS) - Blue Sea Systems 8248 DC Digital Multi-Function Meter With Alarm 

Large, bright LED characters have 3 levels of brightness for easy monitoring of key functions in a splash-proof case. Easy to surface mount in a 2" round hole. Face size is 2.625" W x 1.260" H.8235: 0-60VDC at .01V resolution and has a manual sleep mode.8248: Includes all the features of 8251 plus display amps from -500 to +500 amps DC and includes a 500A shunt.