Since 1993

Prices have increased because of the weak dollar. Order now to get the best price under the current market conditions.

Welcome to the world of tuning like you never thought possible. Now you can tune like the pros with an affordable and accurate exhaust gas analyzer that takes the guesswork out of tuning or use a high tech air fuel ratio meter based on a Bosch wideband O2 sensor with microprocessor control that lets you measure air fuel ratio while driving. Truly a breakthrough in performance tuning.

Gunson Tools

Gunson tools are legendary in the U.K. where they have been helping the do-it-yourselfer tune and maintain their vehicles for decades.

You can stop tuning by ear and start tuning your car, truck or motorcycle the professional way with an exhaust gas analyzer that's proven in 10 years of customer use. Just ask Ducati Richmond. Gastester works!

Gastester measures carbon monoxide the principal indicator of air fuel ratio and combustion efficiency.

I've been selling Gunson tools since 1991 to motor sport enthusiasts like you that want to tune their rides for top performance. I use what I sell and can answer your technical questions about tuning and product selection. But don't ask my competitors tuning questions, they're order takers and not tuners.

I stock all Gunson products imported to the US. If I can't get it no one can.

Check the ads above. Four and five gas analyzers cost thousands of dollars and are overkill for the do-it-yourselfer. With Gastester you get nearly the same results as the expensive gas analyzers at a fraction of the cost. It's almost a no brain'r.

Read the reviews to see what others are saying about Gastester.

Product support is only a phone call away. But please AEP customers only.