Generally it will always start in first gear if you hammer the throttle when stationary. Apart from that, using the kickdown will get it to change down into 1st gear if you're below around 20 mph.

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg