How do you activate KERS, DRS etc without 2d viewer

Im not a subscriber so how do I know when to activate my goodies on the correct part of the circuit?

You can't Jack, only those with 2D can activate them when they want (and then only by turning off auto use of KERS)

DRS is used automatically when available by all drivers, and if you haven't, or can't change the settings (ie not viewing in 2D) then your driver decides when he/she will use KERS (only used for passing/defending as far as I know, they don't go banzai for a 1 lap screamer)

Thanks. Very helpfull info. May subscribe when I've developed the items