Hi. I always strive for the most realistic driving and almost do not use HUD. But when driving a DB 185.* train, as on all German trains, it is impossible to determine wheel slippage due to the missing indicator in the cab. Is there really no such indicator in the original?
If I go up and the traction is used a little more than necessary, then the wheels will slip barely noticeably, which will not be displayed on the power scale
In which case you're driving prototypically. Slight slippage actually increases traction, so long as the wheels don't break free (indicated by wild current fluctuations)