How to measure your car’s horsepower by hand
Wire gauge measures horsepower from the outside to the inside of your car.
The gauge measures power from the engine to the rear wheels.
Wire gauges come in a wide variety of gauges, and they vary widely in their accuracy.
If you don’t know what gauge you have, you can’t tell the difference between the right gauge and the wrong one.
Wire gauge accuracy is also subject to some variation, so it’s important to be very careful with your gauge.