Hi, I’m new here, and I already have some questions! 
Is it possible that MIN and MAX attribute of the GAUGE card are dynamic values?
This is my idea, but it doesn’t work that way:
- type: gauge
entity: sensor.dark_sky_temperature_1h
name: "Temp"
min: "{{ states('sensor.dark_sky_overnight_low_temperature_0d') |int - 1 }}"
max: "{{ states('sensor.dark_sky_daytime_high_temperature_0d') |int + 1 }}"
I look forward to the suggestions and help you can give me!
templates aren’t possible with native lovelace cards. Some custom cards extend templating to all fields on cards.
Do you have HACS installed? I recommend starting there https://github.com/custom-components/hacs. Then download and configure one of the many templating cards.
I came across this as I wanted to make a dynamic gauge displaying vacation mode for my house so I wanted duration and time left. I followed this tutorial Implementing house mode in your Home Assistant – kef.dev
But then came to this page as was not getting anywhere, but I then discovered from hacs the " Config Template Card Card" and then you can use the following example:
type: custom:config-template-card
entities:
- sensor.vacation_duration
- sensor.vacation_remaining
card:
type: gauge
entity: sensor.vacation_remaining
name: Vacation Days Left
unit: days
min: 0
needle: true
max: ${states["sensor.vacation_duration"].state}
segments:
- from: ${states["sensor.vacation_duration"].state * 0.0}
color: '#FF453A'
- from: ${states["sensor.vacation_duration"].state * 0.04}
color: '#FE5235'
- from: ${states["sensor.vacation_duration"].state * 0.09}
color: '#FE5F31'
- from: ${states["sensor.vacation_duration"].state * 0.13}
color: '#FE6C2C'
- from: ${states["sensor.vacation_duration"].state * 0.18}
color: '#FE7A28'
- from: ${states["sensor.vacation_duration"].state * 0.22}
color: '#FE8723'
- from: ${states["sensor.vacation_duration"].state * 0.27}
color: '#FE941F'
- from: ${states["sensor.vacation_duration"].state * 0.31}
color: '#FEA11A'
- from: ${states["sensor.vacation_duration"].state * 0.36}
color: '#FEAF16'
- from: ${states["sensor.vacation_duration"].state * 0.40}
color: '#FEBC11'
- from: ${states["sensor.vacation_duration"].state * 0.45}
color: '#FEC90D'
- from: ${states["sensor.vacation_duration"].state * 0.50}
color: '#FED709'
- from: ${states["sensor.vacation_duration"].state * 0.54}
color: '#EDD20E'
- from: ${states["sensor.vacation_duration"].state * 0.59}
color: '#DCCD14'
- from: ${states["sensor.vacation_duration"].state * 0.63}
color: '#CBC819'
- from: ${states["sensor.vacation_duration"].state * 0.68}
color: '#BAC31F'
- from: ${states["sensor.vacation_duration"].state * 0.72}
color: '#A9BE25'
- from: ${states["sensor.vacation_duration"].state * 0.77}
color: '#98B92A'
- from: ${states["sensor.vacation_duration"].state * 0.81}
color: '#87B430'
- from: ${states["sensor.vacation_duration"].state * 0.86}
color: '#76AF36'
- from: ${states["sensor.vacation_duration"].state * 0.90}
color: '#65AA3B'
- from: ${states["sensor.vacation_duration"].state * 0.95}
color: '#54A541'
- from: ${states["sensor.vacation_duration"].state * 1}
color: '#44A047'
type or paste code here
works perfectly 
Although the dynamic max & segment colors are working perfectly, the gauge card is continuously rendering again when the needle entity changes values. The needle changes the whole time back from 0 to the new updated value instead of the old value to the new. You have that also?
On every change of a monitored entity the config-template-card (CTC) redraws itself.
Animation of the needle (0 → curr value) occurs on a redraw. So - this a inevitable outcome of using CTC.
Ok many thanks for clarification. In my case it’s updated every second, so that’s unfortunately not workable
Wrap into auto-entities like this example:
type: vertical-stack
cards:
- type: entities
entities:
- input_number.test_level_1
- input_number.test_level_2
- type: custom:auto-entities
card:
type: vertical-stack
card_param: cards
filter:
template: >-
{{
{
'type': 'gauge',
'entity': 'sensor.processor_use',
'name': 'Temp',
'severity': {
'green': 0,
'yellow': states('input_number.test_level_1')|int,
'red': states('input_number.test_level_2')|int
},
}
}},
Well many thanks.
That seems to be working without continuous rendering. Your help is much appreciated 
I only don’t get the segments part working, but that’s just because I don’t use the right syntax I guess.
Any idea what would be the right one?
type: vertical-stack
cards:
- type: entities
entities:
- sensor.electricity_meter_huidig_gemiddelde_vraag
- sensor.electricity_meter_maximale_vraag_huidige_maand
- type: custom:auto-entities
card:
type: vertical-stack
card_param: cards
filter:
template: |-
{{
{
'type': 'gauge',
'entity': 'sensor.electricity_meter_huidig_gemiddelde_vraag',
'name': 'Piekverbruik',
'needle': 'true',
'max': states('sensor.electricity_meter_maximale_vraag_huidige_maand')|int,
'segments': {
- 'from': 0
'color': 'green'
- 'from': states('sensor.electricity_meter_maximale_vraag_huidige_maand')*0,8|int,
'color': 'orange'
- 'from': states('sensor.electricity_meter_maximale_vraag_huidige_maand')|int,
'color': 'red'
},
}
}},
list with dicts should be like
[
{'a':'a','b':'b'},
{'a':'a','b':'b'}
]
Many thanks, that’s working!!
Thanks Lidar - managed to ditch one more custom card using your answer as I already use auto-entities
Perfect