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A 12 V solenoid (bang/bang solenoid) will be open/close. The variable tap would be variable in opening as Modena suggests.
To get variable 2 options would be,
a) A PWM solenoid (pulse width modulation)
b) stepper motor with a driver circuit.
Hopefully there is something in use already out there to suit you, else it's going to take a lot of stuffing round to make it/ mount it/ make it work and look good.
Is it an option to get some vac actuators off an old umm?? XF or such heater box and adapt them?
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Missed my Cobra budget by thaaaat much.
Ya get that on big jobs.
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