Is a tacho needed

7160AH:
Leave yard at 6.30
20min drive to first job
Average job 1 hour
Average drive to next site 10 min
Finish last site at 5.00 then 30 min drive back to yard

Other days I might drive 20 minutes to a job and be there all day…

Certainly below the tacho threshold of 30% - more like 20 to 25% at best