Yes you can:
openvrsettings.xml(or one of the other xmls, depens if you have VR or not or oculus or a other HMD) I forgot where the XML file is located but I thought in documents/automobilista 2, if it's not the case then Google it or search for the file on your pc.
<prop name="HUDSettings" offSetX="0.003683" offSetY="-0.004749" offSetZ="-0.374971" scale="0.433146" rotateX="0.000000" rotateY="0.000000" rotateZ="0.000000" rotateW="1.000000" />
Change one of these numbers, according to what you want to change. Scale is for the size. But I also use offset by a large amount, I moved the hud items to the bottom of the visual area so that it's not all in your face all the time in VR. It's a mandatory tweak for me. Good luck.