The button on the end of the turn signal lever cycles the items on the cluster readout.
You need to get a copy of the Owner's Manual - Radio and Information Systems. This describes how to use the MID to select desired readouts for the cluster. You should also get the general Owner's Manual. There are many embedded features that you won't find w/o the manuals.
Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.