[BUG] Boost gauge in the Lancia 037 not working

[RookieOne 61]

Asus Rampage III Formula
Core i7 980x
AMD Radeon R9 280X
12 GB of Ram G.Skills Ripjaws (3X4)

How to reproduce the bug : just select the 037 and drive with the interior view

Bug is simple : the 037 have a boost gauge (as it is a supercharged car), but the gauge is not working at all

Might be worth to correct it(I encircled the gauge in the screenshot) : 

[Porkhammer 78]

The speedometer doesn't work either in any car.