Transductor analógico. Convertir milivoltios en porcentaje

[Macario]

Hola a todos.
Tengo un transductor de presión analógico conectado a un analog input integrado en HA para medir la presión existente en un depósito de agua.
Este transductor lo alimento con 12vdc.
En el Lovelace de HA veo los milivoltios que me devuelve el transductor, y van variando según varía la presión (1140mv cuando el depósito está lleno y unos 450mv cuando está vacío).

Lo que me gustaría es sustituir esa lectura en milivoltios por una gráfica con porcentaje, de manera que la gráfica esté llena (100%) cuando el transductor devuelva los 1140mv, y que la gráfica vaya bajando hasta el 0% coincidiendo con los 450mv.
Actualmente tengo una tarjeta de "Entidades", y he añadido la entidad "sensor.analog_input_1", y me está funcionando como comentaba, mostrando los mv.
Lo he intentado añadiendo una tarjeta de "Indicador", pero al agregar a la tarjeta el "sensor.analog_input_1" me dice que la entidad no es numérica...

No sé por dónde seguir
Alguien sabe cómo puedo conseguir esto?

Gracias de antemano.

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