Adjustable Hobbs Pressure Switch for Fuel Systems
By DeatschWerks | Published: 2026-10-18
Category: Buying Guides
Choose the right adjustable Hobbs pressure switch for your fuel system. Compare 2 PSI, 5 PSI, 10 PSI, and 15 PSI options with pigtail wiring.
Quick answer
Choose an adjustable Hobbs pressure switch that matches your system's activation pressure range. DeatschWerks offers 2 PSI, 5 PSI, 10 PSI, and 15 PSI models, all with 1/8 NPT threads and a pigtail for simple wiring.
Why activation pressure matters
The activation pressure determines when the switch closes or opens an electrical circuit. A switch set too high may never trigger, while one set too low could cause false signals. Adjustable models let you fine-tune the set point within a small window, but you still need to start with the right base range.
Fixed vs adjustable switches
Fixed-pressure switches are simpler and often cheaper, but they lock you into a single activation point. Adjustable switches give you flexibility to dial in the exact pressure your system needs. The trade-off is slightly higher cost and the need to verify the setting during installation.
How to choose the right Hobbs pressure switch
- Identify your target pressure range: Measure or estimate the pressure at which you need the switch to activate. Choose a model whose adjustable range covers that value. If your target is below 4 PSI, the 2 PSI adjustable switch (1–3 PSI range) is your only option. For 4–7 PSI, use the 5 PSI fixed switch. For 8–12 PSI, pick the 10 PSI adjustable switch. For 13+ PSI, the 15 PSI fixed switch works.
- Check electrical load compatibility: All DeatschWerks Hobbs switches listed here are rated for 0.5A. If your circuit draws more current, you will need a relay. Use a relay for loads above 0.5A, such as a fuel pump or solenoid.
- Verify thread size and wiring: All models use 1/8 NPT threads and include a pigtail connector. Ensure your pressure port matches and you have a clean 12V or 24V signal path.
Product facts
- 1/8th NPT 10 Psi Adjustable Hobbs Switch with Pigtail: Adjustable set point from 8 to 12 PSI, 1/8th NPT thread, includes pigtail. Ideal for systems that need activation in the 8–12 PSI range, such as some fuel pressure monitoring or intercooler spray setups.
1/8th NPT 10 Psi Adjustable Hobbs Switch with Pigtail - 1/8th NPT 2 Psi Adjustable Hobbs Switch with Pigtail: Adjustable set point range of 1–3 PSI, factory set at 2 PSI, 0.5A electrical rating. Best for low-pressure sensing applications like boost control or low-pressure warning circuits where precise low-end activation is critical.
1/8th NPT 2 Psi Adjustable Hobbs Switch with Pigtail
Who should use each switch
Best for
- Builders who need precise low-pressure activation (under 4 PSI) — choose the 2 PSI adjustable switch
- Systems that require activation between 8–12 PSI — choose the 10 PSI adjustable switch
- Simple on/off control at a fixed pressure point — choose the 5 PSI or 15 PSI fixed switch
Not for
- High-current circuits (over 0.5A) without a relay
- Applications needing a switch with a normally open and normally closed terminal (these are single-pole single-throw)
