HKS has created an affordable boost controller with the reliability and ease of use HKS electronics are known for.  Called the EVC-S, it has many of the same features of the more expensive HKS EVC 6 but within a display similar to HKS Turbo Timers.

The EVC-S features a solenoid valve specifically designed to accurately control boost pressure up to 250kPa or 36 PSI, 2 boost level settings as well as settings for offset and boost response. 

Also included are
    •    Overboost warning with drop boost feature
    •    Peak hold boost readings
    •    After-image display
    •    Data lock and an internal diagnostic function
    •    Designed to be compatible with both internal and external waste gates, the EVC-S also complements the current HKS Turbo Timers and AF Knock Amp.
    •    Display unit is the same design concept as the latest HKS electronic products
    and is selectable from kPa to PSI
    •    Factory boost function when power is off
    •    2 control modes (A/B mode)
    •    Basic parameters Offset, Response
  Control range of solenoid duty output = 0 - 100%
    •    Diagnosis function for malfunction of boost sensor, solenoid valve or wiring connection

http://www.hks-power.co.jp/en/product/electronics/boost/evcs/index.html