TachoSpeed
Classic-car GPS tach & speedo
About
This app functions as a GPS-driven tachometer and speedometer for vehicles with non-working speedometers but functional tachometers. It allows for a single calibration point to accurately display engine RPM and GPS speed simultaneously.
What's New in TachoSpeed
1.0
May 26, 2026
Developer apps
FAQ
What is TachoSpeed?
TachoSpeed is a standalone GPS tachometer and speedometer designed for vehicles, particularly classic cars, where the original speedometer is not functioning but the tachometer is. It uses your phone's GPS to calculate and display engine RPM and road speed.
How do I calibrate TachoSpeed?
Calibration is a one-time process. You select a cruising gear, maintain a steady speed, note your dash tachometer's RPM, and tap to log this point. TachoSpeed then uses this data to derive your engine RPM from any future GPS speed.
Does TachoSpeed work in all gears?
The RPM dial is accurate in the gear you calibrated. However, the digital GPS speed readout is accurate in any gear, including during downshifts, neutral, and between gear changes.
What units does TachoSpeed support?
TachoSpeed supports both MPH and KM/H. Both scales update instantly, allowing you to choose your preferred unit of measurement.
Does TachoSpeed require an internet connection?
No, TachoSpeed does not require an internet connection. It makes no network requests and processes all GPS speed data entirely on-device for privacy and offline functionality.
What is the price of TachoSpeed?
TachoSpeed is a paid application, available for $0.99. This one-time purchase grants you access to all its features without any additional in-app purchases or subscriptions.
Does TachoSpeed have ads?
No, TachoSpeed is completely ad-free. The app description explicitly states 'No ads. No tracking,' ensuring an uninterrupted user experience.
What devices is TachoSpeed compatible with?
TachoSpeed is a universal app compatible with both iPhone and iPad. It is also 'Designed for iPad' on Apple Silicon Macs, offering broad platform support.