Curtis Instruments India Private Ltd. Offers Field Programmable Maintenance Monitors. Curtis Instruments India Private Ltd. Is an ISO 9001:2008 registered company. The Field Programmable Maintenance Monitors can be coupled with any of the following gauge functions and display in bargraph or numeric, in any combination Fuel gauge, Temperature gauge, Pressure gauge, Battery Indicator, Voltmeter, Tachometer, and Settable hour meter [total vehicle hours can be retained when replacing an hour meter with a maintenance monitor].