Just bought my 3rd FL2; 2013 SD GS Auto:both the rev counter and speedometer go to max for a second or two every time ignition is switched on, gauges work perfectly.
Previous 08 and 10 models did not do this.
Reason I ask is that on Ford Focus when gauges do this it is a self test dianostic check when low voltage is detected. Often on vehicles used mainly on stop start short journeys. Charge battery and all usually OK. This may not apply to recent Fords. All FL2's (3) Gone
2011 Mercedes C180 CGI Gone
FL2 GS Auto SD with heated leather, factory tints, alloy spare and a few other bits.

I think this is a post ( power on self test) but is not a sign of a fault unless it doesn't do it properly. I'm sure someone will correct me if I'm wrong.

I am sure its normal on the newer models I may be wrong, my Wifes Lexus's have always done it as part of there start up routine. HSE TD4 Stornoway Grey ★ Rear Spoiler ★ Black Leather Interior ★ Panoramic Roof ★ Navigation with Bluetooth ★ 19 " Alloys ★ Alpine Stereo 10 Disc Auto changer and Ipod connection and lots of other nice toys ★

My MY14 GS does it every time I switch on .

MY10 HSE did it, MY13 XS and HSE Lux do it.

A rev Rounter?

Mine does that. SD4 HSE Lux Orkney Grey,Full size spare tyre,Ugly kid glass.