Best Oil Pressure Test Adapter for GM (2026): 4 Picks for the Garage
4 oil pressure test adapters for GM engines, from an LS swap fitting to a 2-adapter kit, compared by thread, ports, material and fit.
On this page
Top picks at a glance
As an Amazon Associate I earn from qualifying purchases.
- 1
Best Overalljoytrace LS Adapter9.7/10View on Amazon - 2
Best KitBonbo EN-47971 & 72199.6/10View on Amazon - 3
Best Small BlockAbode Small Block9.6/10View on Amazon - 4
Best BasicMEKILYN 305/3509.5/10View on Amazon
An oil pressure gauge that reads low, a warning light that flickers at idle, a fresh LS swap that needs a sender port: the adapter is the small fitting that puts a gauge or sender on the engine. This guide compares adapters in the best oil pressure test adapter for gm roundup, by thread, ports, material and fit, and lists what each listing states.
GarageToolHQ earns a commission when you buy through links on this page, at no extra cost to you. Read our affiliate disclosure.
Quick picks
- Best Overall joytrace LS Adapter: 304 stainless, M16-1.5 to 1/8 NPT, 12-month warranty Check price on Amazon
- Best Kit Bonbo EN-47971 & 7219: 2 adapters for Gen 3, 4 and 5 V8 engines, dual ports Check price on Amazon
- Best Small Block Abode Small Block: Dual 45 and 90 degree ports, plug included, for 305 and 350 Check price on Amazon
- Best Basic MEKILYN 305/350: Dual 45 and 90 degree ports for 305 and 350 Check price on Amazon
Picks for the garage
LS Swap Oil Pressure Sensor Adapter M16-1.5 Male
LS swap oil pressure sensor adapter, M16-1.5 male to 1/8 NPT female, 304 stainless steel, with a 12-month warranty.
Pros
- M16-1.5 male to 1/8 NPT female for GM LS engines
- 304 stainless steel for corrosion resistance
- Compact design for tight LS swap spaces
- 12-month warranty
Cons
- 1 female port only
- No weight is stated
- No torque figure is stated
- Fits LS series only, not small block 305 and 350
EN-47971 Oil Pressure Gauge Adapter & 7219 Oil
2 oil pressure gauge adapters for Generation 3, 4 and 5 GM V8 engines, aluminum, with dual ports.
Pros
- 2 adapters cover Generation 3, 4 and 5 V8 engines
- Dual ports for a pressure gauge
- Installs in place of the spin-on oil filter
- Aluminum, high strength and rust resistant
Cons
- No thread size is stated
- No warranty term is stated, only a 30-day return
- No weight is stated
- No torque figure is stated
Oil Pressure Sensor Thread Adapter for Chevy Small
Oil pressure sensor thread adapter for Chevy small block 305 and 350, with dual 45 and 90 degree ports and a plug.
Pros
- Dual 45 and 90 degree female ports
- Port plug included to seal an unused port
- Steel with nickel-plated zinc
- Threads onto the existing sensor port, no drilling
Cons
- No warranty term is stated
- No torque figure is stated
- Fits small block 305 and 350 only
- No dimensions are stated
Oil Pressure Sensor Thread Adapter
Oil pressure sensor thread adapter for GM and Chevy small block 305 and 350, with dual 45 and 90 degree ports.
Pros
- Dual 45 and 90 degree female ports
- Threads onto the existing sensor port, no drilling
- Steel built for the engine compartment
- Enough clearance to save time on installation
Cons
- No warranty term is stated
- No port plug is stated
- No dimensions are stated
- No torque figure is stated
Compared on paper
| Model | Shop Score | Thread | Ports | Material | Fit | Warranty |
|---|---|---|---|---|---|---|
| joytrace LS Adapter | 9.7/10 | M16-1.5 male to 1/8 NPT female | 1 female | 304 stainless steel | GM LS series | 12-month warranty |
| Bonbo EN-47971 & 7219 | 9.6/10 | Not stated | Dual ports | Aluminum | GM 4.8L to 6.0L, 1996-2006 and later | Not stated |
| Abode Small Block | 9.6/10 | 1/8-27 NPT male | 2 female, 45 and 90 degrees | Steel, nickel-plated zinc | Chevy small block 305, 350 | Not stated |
| MEKILYN 305/350 | 9.5/10 | 1/8-27 NPT male | 2 female, 45 and 90 degrees | Steel | GM/Chevy small block 305, 350 | Not stated |
Specifications are manufacturer rated, as published on each listing and collected 4 November 2026.
How the points were given
Each adapter is scored on performance, build, value, safety and warranty. Safety scores zero here: no listing states an electrical listing or certification for the adapter. Warranty scores only where the listing states a term, which is the 12-month warranty on the joytrace LS adapter.
| Product | Shop Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| joytrace LS Adapter | 9.7 | 30 | 21 | 20 | n/a | 2 |
| Bonbo EN-47971 & 7219 | 9.6 | 29 | 20 | 20 | n/a | 0 |
| Abode Small Block | 9.6 | 28 | 20 | 20 | n/a | 0 |
| MEKILYN 305/350 | 9.5 | 28 | 19 | 19 | n/a | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.
What the listings tell you
All 4 adapters are thread adapters that put an oil pressure gauge or sender on a GM engine. The joytrace adapter is M16-1.5 male to 1/8 NPT female in 304 stainless steel, the MEKILYN and Abode adapters are 1/8-27 NPT for Chevy small block 305 and 350 engines, and the Bonbo kit is 2 adapters for Generation 3, 4 and 5 V8 engines. Only the joytrace listing states a warranty term.
Buying guide: the best oil pressure test adapter for gm
Thread first
Thread decides whether the adapter fits the block, so match the engine before anything else. The joytrace adapter is M16-1.5 male to 1/8 NPT female for GM LS series engines, while the MEKILYN and Abode adapters are 1/8-27 NPT male for Chevy small block 305 and 350 engines. The Bonbo kit does not state a thread size, so check the listing for the EN-47971 and 7219 adapters before buying.
One port or two
Ports decide how many senders the adapter takes. The joytrace adapter has one 1/8 NPT female port, while the MEKILYN and Abode adapters have 2 female 1/8-27 NPT ports at 45 and 90 degrees, one for the oil pressure sensor and one for an oil temp or other sensor. The Bonbo kit provides dual ports for a pressure gauge, with a bottom or side connection.
Material
Material decides how the adapter holds up in the engine bay. The joytrace adapter is 304 stainless steel, the Abode adapter is steel with nickel-plated zinc, the MEKILYN adapter is steel, and the Bonbo kit is aluminum. All 4 listings claim corrosion resistance and durability, which is the maker’s claim, not a measured result.
Fit for LS swaps and small blocks
Fit is the difference between these picks. The joytrace adapter lists GM LS series engines, including LS1, LS3, LSX and 4.2L, 4.3L, 4.8L, 5.3L, 6.0L and 6.2L, and a compact design for tight LS swap spaces. The MEKILYN and Abode adapters list Chevy small block 305 and 350 engines. The Bonbo kit lists Generation 3 V8 engines from 1996 to 2006 and Generation 4 and 5 V8 engines, including the 2006-later Corvette.
Installing without drilling
These adapters thread onto the existing oil pressure sensor port, so no drilling is needed. The MEKILYN and Abode listings state that the adapter threads onto the existing port and saves the work of drilling or other modifications. Thread the adapter in by hand first, then tighten it with a wrench, and check for leaks with the engine running.
Use rated jack stands on solid ground, wear eye protection with power and air tools, keep fuel-burning equipment out of a closed garage, and follow the manual for every tool. Read our Safety Disclaimer.
Garage Fit Check
- Space: the joytrace adapter measures 1.02 by 0.98 by 0.98 in, and the listing states a compact design for tight LS swap spaces.
- Tools: the adapters thread onto the existing oil pressure sensor port, so no drilling is needed, per the MEKILYN and Abode listings.
- Parts: the Abode adapter includes a 1/8-27 NPT port plug to seal an unused port, and the Bonbo kit includes 2 adapters.
- Before the first job: check the thread against the block, M16-1.5 to 1/8 NPT on the joytrace and 1/8-27 NPT on the MEKILYN and Abode, and check the listing for the Bonbo thread.
FAQ: garage tools
What thread does a GM oil pressure sensor use?
It depends on the engine. The joytrace adapter is M16-1.5 male to 1/8 NPT female for GM LS series engines, and the MEKILYN and Abode adapters are 1/8-27 NPT for Chevy small block 305 and 350 engines. Check the manual for the thread on the engine before buying.
Where does an oil pressure adapter fit on a GM engine?
On the existing oil pressure sensor port. The joytrace listing states the adapter installs at the top rear or front accessory drive side of the engine block, and the Bonbo kit installs in place of the spin-on oil filter. Check the manual for the port on the engine.
Do I need a gauge and a sender?
A gauge shows the pressure and a sender feeds it, and the adapter gives them a port. The MEKILYN and Abode adapters have 2 female ports, one for the oil pressure sensor and one for an oil temp or other sensor, so a gauge and another sensor can share the adapter.
Can I install an oil pressure adapter without drilling?
Yes. The MEKILYN and Abode listings state that the adapter threads onto the existing oil pressure sensor port and avoids drilling or other modifications. Thread it in by hand first, then tighten it with a wrench.
Related: the best digital multimeter for home garage, bluetooth vs wired OBD2 scanner, oil change DIY kit, types of oil filters, how to remove an oil filter and our diagnostics and electrical hub.
