The pressure reducer is used to stop the rears locking before the fronts,ideal brake distribution is 60/40 front to rear.
As Ronnie said the valve is fitted to n/s on the Sierra and feeds the rear system,if the Wilwood is adjustable it will not pass iva.
You may be better off fitting an inline valve from a Corsa or Mondeo from the rear brake pipes close to the cylinders.
(Corsa one's are fitted near battery)
Fit this in the feed to the rear and I personally will fit the pressure switch to this line for the brake lights.
Hope it makes sense.
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