Car battery putting out too much power?

So I have a 1991 Ford ranger. Up until today everything has been fine it has a rebuilt engine and a ton if new parts. The battery is an optima red top. The truck has a voltage meter but the person I bought it from put in a custom console that has a digital voltage display. Usually it reads around 12.5 volts sometimes more sometimes less. But today it's reading around 14.3 volts and the needle on the gauge moved up past what would be considered normal. Any ideas what could be causing this?

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