The present invention relates to an engine speed indicator for a vehicle, which is driven by a combustion engine (4). The engine speed indicator comprises a first indicating means (1, 13) arranged to show the actual member of revolutions of the engine and second indicating means (7a-b, 8a, 14) arranged to show at which number of revolutions or within which range of number of revolutions a minimal emission of at least one emission gas is obtained from the vehicle during operation of the combustion engine (4). The engine speed indicator also comprises a third indicating means (8a, 15) which is arranged to show an emission level of said emission gas at the actual value of the number of revolutions. A driver can hereby drive the vehicle in such a manner that the emissions of emission gases are substantially minimal.