The tachograps simulator CMP-1 simulate the tachographs operation.

We advice it particularly in cases,  when the regulations do not require endowment of the vehicle in tachograph, but the electronic instruments installed in a vehicle are geared  by the speed and road signals for example: an electronic speedometer, a deck computer etc.  

We do hope, that such  much cheaper solution to get a speed and road signal  without necessity of employment the tachograph  that gives you CMP-1, shall be interested for you.