Fuel Pressure Gauges

Fuel Pressure Gauges: read what your fuel system is actually doing

A fuel pressure gauge tells you the pressure your pump and regulator are delivering to the injectors. That number matters because pressure sets how much fuel each injector flows for a given pulse width. Fit a gauge and you can confirm a new pump is holding pressure, verify a regulator is set where you want it, and catch a failing pump or a clogged filter before it leans out the engine. Mechanical fuel pressure gauges like the ones here plumb inline or into a port and read pressure directly, no sender or wiring needed.

What ThreePiece stocks

This category currently holds 6 fuel pressure gauges from 2 brands: Radium Engineering and DeatschWerks. Prices run from $48 to $142 for what is in stock now, which is the current range and not a fixed promise. At the top is the Radium Engineering Lotus Elise/Exige (2ZZ-GE) Fuel Pressure Gauge PTFE Hose Kit, a vehicle-specific kit. If you want a more universal fit, the Radium Engineering 0-100 PSI gauge with 8AN adapter gives you an AN plumbing option, while the DeatschWerks 0-100 PSI 1/8in NPT gauge with blue face and the plain black-housing DeatschWerks 0-100 PSI 1/8in NPT gauge use an NPT thread.

How to choose

The main decision is how the gauge plumbs in. The DeatschWerks gauges use a 1/8in NPT thread, which suits a regulator port or an NPT adapter fitting, and they are the lower-cost end of the range. The Radium 8AN version comes ready for AN lines, which is the easier path if your fuel system is already built on AN plumbing. The Lotus kit is different again: it ships as a PTFE hose kit sized for the application rather than a bare gauge, which is why it sits at the top of the price spread. Pick the thread and hose format that matches how your fuel rail and regulator are already set up.

What else you need with it

A gauge only earns its keep alongside the rest of the fuel and plumbing hardware. Browse Fuel Pumps if you are chasing a pressure problem to its source, and pair the gauge with the right Adapters and Fittings to get it plumbed into an NPT or AN port. Other engine work often rides along, so it is worth checking Gasket Kits and Oil Filters while you are under the hood. All of these sit in the wider Engine Components section.

Fitment and ordering

Within the current range, one gauge carries specific fitment data: the Radium PTFE hose kit is listed for the Lotus Elise and Lotus Exige from 2005 to 2011. The other gauges are sold as universal-fit hardware chosen by thread and plumbing. If you are unsure which thread or hose kit suits your setup, call the team for fitment help at 813-535-5801 or reach out through contact us. Every order ships free, and Affirm and Katapult financing is available at checkout.

Fuel Pressure Gauges: read what your fuel system is actually doing

A fuel pressure gauge tells you the pressure your pump and regulator are delivering to the injectors. That number matters because pressure sets how much fuel each injector flows for a given pulse width. Fit a gauge and you can confirm a new pump is holding pressure, verify a regulator is set where you want it, and catch a failing pump or a clogged filter before it leans out the engine. Mechanical fuel pressure gauges like the ones here plumb inline or into a port and read pressure directly, no sender or wiring needed.

What ThreePiece stocks

This category currently holds 6 fuel pressure gauges from 2 brands: Radium Engineering and DeatschWerks. Prices run from $48 to $142 for what is in stock now, which is the current range and not a fixed promise. At the top is the Radium Engineering Lotus Elise/Exige (2ZZ-GE) Fuel Pressure Gauge PTFE Hose Kit, a vehicle-specific kit. If you want a more universal fit, the Radium Engineering 0-100 PSI gauge with 8AN adapter gives you an AN plumbing option, while the DeatschWerks 0-100 PSI 1/8in NPT gauge with blue face and the plain black-housing DeatschWerks 0-100 PSI 1/8in NPT gauge use an NPT thread.

How to choose

The main decision is how the gauge plumbs in. The DeatschWerks gauges use a 1/8in NPT thread, which suits a regulator port or an NPT adapter fitting, and they are the lower-cost end of the range. The Radium 8AN version comes ready for AN lines, which is the easier path if your fuel system is already built on AN plumbing. The Lotus kit is different again: it ships as a PTFE hose kit sized for the application rather than a bare gauge, which is why it sits at the top of the price spread. Pick the thread and hose format that matches how your fuel rail and regulator are already set up.

What else you need with it

A gauge only earns its keep alongside the rest of the fuel and plumbing hardware. Browse Fuel Pumps if you are chasing a pressure problem to its source, and pair the gauge with the right Adapters and Fittings to get it plumbed into an NPT or AN port. Other engine work often rides along, so it is worth checking Gasket Kits and Oil Filters while you are under the hood. All of these sit in the wider Engine Components section.

Fitment and ordering

Within the current range, one gauge carries specific fitment data: the Radium PTFE hose kit is listed for the Lotus Elise and Lotus Exige from 2005 to 2011. The other gauges are sold as universal-fit hardware chosen by thread and plumbing. If you are unsure which thread or hose kit suits your setup, call the team for fitment help at 813-535-5801 or reach out through contact us. Every order ships free, and Affirm and Katapult financing is available at checkout.