12V Red Voltmeter and Ammeter 6-30V 0-10A

Not what I wanted, it covers the range for voltage and current I wnted, but it has no input for its own operating voltage, which I guess will be 5 volts, so until my variable voltage reaches 5 volts it will not read. I should have realised as it is only 3 terminals and very well sealed so I can not break into it to feed it with its operating voltage, my fault but £26 quid down the drain.