Water cooling, fan, water and hotend temperature FFR 3.0

pipersw

I have wired the pump, radiator fan and flow meter to the fan 1 connector, and I want to control them thermostatically.
The hotend is water cooled, the 24V psu is controled by PS_ON pin on Duet, with 24V to 12V DCDC converter for water cooling.
water cooling voltage.JPG

The best is to powered the pump all the time with 12V and only the fan thermostatically, or I could control pump + fan thermostatically?

Here under it's possible to control pump + fan with different temperature for water and hotend ?
Does it take sense ? and does it works ?

; Thermal Sensors
M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.060000e-8 R4700  ; configure sensor 1 as thermistor on pin e0temp
M308 S3 P"e1temp" Y"thermistor" T10000 B3950 R4700 A"Water"       ; configure sensor 3 as thermistor on pin e1temp for temp water

; Fans
M950 F1 C"fan1+^exp.pb6" Q500     ; create fan 1 on pin fan1 and set its frequency
M106 P1 H1 T45                  ; Set fan 1/pump value, turned on if hotend reaches 45C
M106 P1 H3 T30                  ; Set fan 1/pump value, turned on if water reaches 30C

dc42

The second M106 P1 will override the first. I suggest you control the fan and pump from separate outputs and configure them as two different fans.

pipersw

All the fans connectors are used already.
So I have to

put pump + flowmeter + fan on fan 1 connector ?
or just the fan on fan 1 connector, and the pump + flowmeter on 12V (thought DCDC 24V controled by PS_ON) ?