a recording tachometer.
Origin of tachograph
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a tachometer that produces a graphical record (tachogram) of its readings, esp a device for recording the speed of and distance covered by a heavy goods vehicleOften shortened to: tacho
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012