I used the dev app named Camera Editor. You can enable these if u go to assettocorsa/system/cfg/assetto_corsa.ini and find and set ENABLE_DEV_APPS=0 to 1. Then you can find the app ingame like every other
I like it but it could use some improvements. It sounds a little fuzzy and not as clear as the real onboards. The downshift sound is also a little too strong. Thanks a lot though ive been waiting for good f138 sounds for a while and these are very good.