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WB B2 Digital Vacuum/Boost Display Gauge
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B2 WB Boost Gauges

Please note that all APSX WIDEBAND products are tested and calibrated just before they are shipped from Cincinnati, OH validating that they are working properly.

  1. Displays boost in 0.1 PSI (60 PSI max) and to display vacuum in 1 In.Hg (-30 In.Hg max) increments
  2. Sweeping RED LED "needle" boost indicator from 0 to up to 60 PSI (10 PSI and 30 PSI are other options) and single BLUE LED vacuum light
  3. Pre-assembled plug and play cable harness with built-in sensor on the gauge
  4. Faceplate (30PSI black or 60PSI white)
  5. Multiple outputs for digital (to PC) and 0-5V analog (to data logger / EMS)
  6. NO need a PC or tablet for programming upper/lower limits and other settings
  7. LED display (RED, BLUE, ORANGE, WHITE) has daylight sensor to adjust the intensity automatically

Simple Installation

B2 fits in a standard 2-1/16” (52mm) hole. Mounting should be done very carefully to prevent cables and the hoses being pulled forcefully from the gauge. B2 gauge should not be submerged under water or exposed to pressured water source. Find a vacuum source on the intake manifold side and connect it to the hose fitting provided. If needed, secure the hose with hose clamps or tie zips. 

0-5V Analog output for engine management systems (EMS) and data loggers 
Lower and upper limits are 0 PSIa and 80 PSIa (0V = 0 PSIa, 5V = 80 PSIa) 
Digital output is 9600 8N1 serial that can be connected to a PC 
Both EFI and carburated applications are ok. 
* The low and high limits for analog and simulated NB (NarrowBand) can be modified using the programming procedure. 

WB B2 has a 4ft output cable (4 cables / green-white-red-black). Red power cable goes to a switched 12V source which comes ON when the ignition is ON. Please use a minimum 2A fuse with the connection. Black cable goes to a grounded source such as battery ground (-) post. Green digital output is 9600 8N1 serial that can be connected to your PC. If you want to connect other devices such as data loggers, you can use white analog cable for 0-5V output. The cable (4ft) and the vacuum hose should be routed in a way so that there would not be any contact extreme heat sources to prevent damage. 

PROGRAMMING Power up LED display sequence: Range (Default 10 PSI / 30/ 60) Over Boost Warning Limit (Default 8 PSI/ Range 1-60 PSI) PSI or BAR selection (1 PSI / 0 BAR) 
You can cycle the menu display from 1 to 4 by pressing and depressing the button at the back side as hidden under the plastic tab. Just push your finger on the tab and sense the button clicking. Select the menu item you want to modify by pressing the button.

  1. Set the RANGE (cycles 10, 30, 60) by pressing the button
  2. Set Over Boost Warning Limit (cycles from 1 to 60) by pressing the button
  3. Set for PSI mode
  4. Set for BAR mode

When the Over Boost Warning Limit is reached all RED LEDs will flash. 


Turn it on while you hold the switch at the back and release afterwards. It should calibrate by itself.

WB does not pay for the customs fees and taxes and VAT for international orders. That is customers responsibility to pay and receive it when the product comes to customs clearing process stage.

WB does not guarantee the product functionality with any ECU, data logger or other devices that uses the output signals. Implementation and integration of the product with any other device(s) must be done at your own risk. Improper installation and usage may lead to engine damage. Mount and install the product in a location where it does not obstruct the driver’s view and/or ability to safely control the vehicle.
WB warrants this product to be free from defects for 12 months from the date of purchase. Oxygen sensors are excluded from stated warranty. WB’s obligation under warranty shall be limited to repairing or replacing, under the discretion of WB, any part proven defective. This warranty is limited to the repair or replacement of parts in the manufactured good and the necessary labor done to affect its repair or replacement.
In the unlikely event that your WB hardware should fail during the warranty period, a Return Material Authorization number (RMA) must be first retrieved from WB. Support can be contacted through email: at All serviceable goods must be packaged securely, RMA number, with all shipping charges prepaid and shipped to WB. Goods returned under warranty must be received by WB within ten (10) business days after the RMA number has been issued. Goods received after this period is subject to fees for the service of repair or replacement.
WB shall not be liable for direct, special, incidental, or consequential damages resulting from any legal theory including, but not limited to, lost profits, downtime, goodwill, damage, injury to persons, or replacement of equipment and property due to improper installation, integration and/or misuse of any WB’s product(s). This warranty applies to the original purchaser of product and is non-transferable. All implied warranties shall be limited in duration to the said 90 day warranty period.
This warranty shall terminate and WB shall have no obligation pursuant to it if (1) your product has been modified or repaired in a manner not previously authorized by WB in writing, (2) your product was subjected to accident, abuse, shipping damage, or improper use; (3) your product was not used or configured as specified in the this manual; or (4) your product was subjected to operating conditions more severe than those specified in the this manual.
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