Set up reliable on boost control with the Adjustable Hobbs Switch with Wiring Harness from Nforcd. This simple, normally off boost pressure switch closes at a chosen boost level to trigger your accessory automatically. Available in 4 psi or 15 psi preset options and supplied with a ready to use wiring harness, it is ideal for turbocharged and supercharged applications where you want consistent, hands free activation.
- Choose your preset: 4 psi or 15 psi boost activation
- Fine tune the set point using the internal Allen adjuster by approximately +/- 3 to 4 psi
- Includes wiring harness: 12 inch chassis ground lead and 60 inch trigger ground lead
- Simple two wire install for ground triggered accessories
- Great for auxiliary fuel pump control or methanol injection pump activation at boost
- Clockwise adjustment increases the boost pressure required to switch on
Which option should you choose? For a secondary low pressure fuel pump, select 4 psi if your primary pump is stock. If your primary pump is upgraded, go for 15 psi. For triggering a methanol injection pump, the 4 psi option is recommended.
Installation is straightforward. Connect one contact to a solid chassis ground and the other to your accessory’s ground trigger wire. To adjust the activation point, remove the black rubber plug on top and use an Allen key. Make very small adjustments, as the mechanism is sensitive and over adjustment may lock it out.
Order with confidence from Nforcd. If you would like professional installation, fitting is available through Nforcd in Warwickshire. Request a quote at Sales@nforcd.com.



