One cylinder tells you nothing; the spread tells you everything · review
The diesel kit, and the reason a petrol tester cannot be used on a diesel: 70 bar rather than 20, with injector and glow plug adapters instead of spark plug threads.
The last word Not an upgrade on the petrol kits — a different tool for a different engine.
A 0–70 bar gauge with a rotating quick coupler, a release valve and a set of adapters for injector and glow plug ports.
Compression ratios are far higher, and pressures with them. A petrol gauge reading to 20 bar is not merely inaccurate on a diesel — it is off the scale. And there is no spark plug hole to screw into: the connection is made where an injector or glow plug was.
The release valve, which lets you take a second reading on the same cylinder without breaking the connection, and the rotating coupler, which lets an adapter be tightened deep in a head while the hose stays put.
In the engine manufacturer’s documentation, which publishes both the expected pressure and the permitted difference between cylinders. This page describes the tool.
Not found on the American Amazon store, where the buy link falls back to a local search rather than to a page that does not exist.
Prices and availability are what Keepa reported on the date this page was updated; both move.
| Engine type | Diesel — cars, tractors and trucks, stated |
|---|---|
| Gauge | 0–70 bar / 1000 psi, stated |
| Pieces | 17-piece universal kit, stated |
| Coupler | Rotating quick coupler for fast adapter changes, stated |
| Release valve | Built-in, for repeated tests without disconnecting — stated |
| Materials | Copper and steel, stated as hard-wearing |
| Amazon reference | B0DS9BJZVV |
| EAN | 0774388198283 |
No. Diesel compression pressures are far above a 20 bar gauge, and the connection is made through an injector or glow plug port rather than a spark plug thread. The two kits are not interchangeable in either direction.
By the port you are removing — injector or glow plug — and its thread. That is per engine, and the workshop manual for the vehicle is where it is published.
8.7/ 10
Not an upgrade on the petrol kits — a different tool for a different engine.
A reference exists on these Amazon stores: France, Germany, Italy, Spain, United Kingdom. Listed is not the same as in stock — availability changes daily.
Details checked on September 4, 2026.
A diesel car, van or tractor — where a petrol gauge would read off the top of its scale.
Specifications: the manufacturer sheet for garage tools and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
Petrol · 0–300 psi / 0–20 kg (0 to 44.1 lb)/cm² · 4 thread adapters including M10 for motorcycles · 2 rubber cones
A petrol kit whose listing names the M10 adapter as the motorcycle size — a small honesty that tells you the maker knows what the set is used for.
Best for: A household with a car and a motorcycle, where one kit should cover both.
Petrol · analog dial 0–20 bar / 0–300 psi / 0–2000 kPa · adapter hose or rubber cone tube · M10–M18
The workshop-brand version: an analog dial with three scales, an adapter hose and a rubber cone tube, from a maker whose catalog numbers mean something.
Best for: Someone who expects to still own this in fifteen years.
≈ $105
Petrol · 0–300 psi / 0–20 bar · M10, M12, M14, M18 adapters · 7.6 cm (3 in) gauge · two rubber cone ends
The cheapest complete petrol kit here, and it includes the two rubber cone ends that let you take a reading without threading anything into the head.
Best for: A first compression test on a petrol engine, where the spread between cylinders is the answer.
≈ $17
