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SOLVED
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when I adjust my gearbox, sometimes the speed reached was not displayed and I suspected a bug. So I reinstalled LFS because it was an old installation from several years ago, regularly updated. but in fact I had not seen that we could visualize the speed according to the rpm: - $ ....
: - / and now nothing is displayed in the game!
HELP!

problem solved !

the speed reached was displayed by LAZY.

i reinstall it, and solve the problèm

sorry for the disturbance