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just use an rpm activated switch or tachometric relay
or run it off fuel pump power
connect one of these triggers to a relay which then triggers a solenoid
to unlock the steering wheel
but i recon there has to be a secondary safety
what if u stall car or something and suddenly u loose steering
id pressume the prado shold have something incase u loose power
u dont want steering lock to come on
so might have some mechanical system as backup