Baker Electronix


(RPM Window Switch And the Adjustable-RWS)


The ARWSr/RWSr module is an electric switch that activates above your selected turn-on RPM, and can deactivate above a higher turn-off RPM.  The RPM range is called a window, or RPM window.  This module is perfect for applications like enabling/disabling your NOS (Nitrous Oxide System) injection, shift lights, Rev-limiter or turning on/off just about anything. The ARWSr/RWSr module works on the standard coil signal that most tachometers would use, without effecting your tachometer readout, as well as 0-5V engine speed signals that some newer vehicles use. The module’s output can ground 2.0A directly, or the output can be used to activate a relay to operate any required loads.  No expensive RPM plug in “pills” to buy, the RWSr comes preprogrammed to your needs.


When ordering the RWSr we will need to know what type of engine this will be used with (4 cylinder, 6, 8, 12, LS1, Vortec, 2-Stroke, Wankel, etcetera) and your RPM window selection (a lower Turn-On RPM and it can have an optional higher Turn-Off RPM)

When ordering the ARWSr you must specify what type of engine this will be used with (4 cylinder, 6, 8, 12, LS1, Vortec, 2-Stroke, Wankel, etcetera) and your 8 RPM window selections (each window must have a lower Turn-On RPM and can have an optional higher Turn-Off RPM).  After you receive your ARWSr module you can select from each of your 8 settings by adjusting its three switches. 

The RWSr, and ARWSr, modules are Factory Re-Programmable; If you ever need new settings programmed into your module, just email us for a reprogramming quote and Return instructions.


  • Microcontroller based for reliability and accuracy
  • Reverse voltage protection in the event of incorrect power connections
  • Short circuit protection on all inputs and outputs to 12V or ground
  • Output can sink/ground 2.0A continuous to ground, up to a 3A surge
  • Waterproof
  • Low current (5 - 15mA)
  • Indicator LED to confirm operation and indicate mode
  • Works from 8V to 25V supply voltage
  • Light weight (31g)
  • Small package (5.4cm x 3.5 cm x 1.5cm)
  • Factory Re-Programmable
  • 12 month warranty from date of purchase against manufacturer defects
If you wish to purchase 4 or less modules, you can purchase via Credit Card or PayPal by using the buttons below.  Your order will ship to you via USPS Priority Mail.
If you want to purchase 5 or more modules or would like a different shipping method, please email us (at for a quote. Please include the following in your email - your module selection, quantity and your full shipping address.
For technical questions please email us at