A GPS tachometer and speedometer for vehicles whose speedometer doesn’t work.
TachoSpeed is for classic cars, restorations, and anything else with a working tachometer but a broken or missing speedometer. Calibrate once and TachoSpeed turns your phone’s GPS into a live analog tachometer dial — with both an RPM scale and an equivalent road-speed scale on the same gauge.
Calibration takes about a minute. Pick a cruising gear, settle at a steady speed, read the exact RPM off your dash tach, tap to log. Because gearing is linear within a gear, that single point is enough — from then on TachoSpeed derives engine RPM from your live GPS speed.
Get the app
Features
- Live analog tachometer dial driven entirely by GPS — no OBD-II adapter, no hardware
- One-time calibration in any gear you choose
- RPM scale plus a matching road-speed scale on the same dial
- Current GPS speed always shown as a large digital readout — accurate in any gear
- Adjustable dial maximum (4,000–12,000 RPM) and redline
- MPH or KM/H, your choice
- Recalibrate any time from Settings
- No accounts, no ads, no tracking, no network access at all
The RPM dial is accurate in the gear you calibrated. The digital GPS speed in the center is accurate in any gear.