Decimals, gauges and templates problem


My ESP Home has a salt level sensor and it outputs in meter (e.g. 0.13 m). I’d like to convert this to percentage for a gauge but need help!

My ESP Code:

  - platform: ultrasonic
    name: "salt_level_sensor"
    unit_of_measurement: "cm"
    trigger_pin: D5
    echo_pin: D6
    pulse_time: 200ms
    update_interval: 3s
    accuracy_decimals: 2
    timeout: 4m
      - lambda: if (isnan(x)) {  return 3.1; } return x;

My Gauge code via a template:

type: gauge
entity: sensor.salt_level_percent
name: Zout Niveau 80% = leeg)
min: 0
needle: true
max: 100
unit: '%'
  green: 0
  yellow: 80
  red: 90


How to make it say 56% instead of 56.666666666667% ?

add |round(0) to the end of the template