Rover 75 diesel ECU change

Hi there, i have LDH 2001 Rover 75 Tourer diesel 85kw with manual gearbox, but speedo aint working for me (rpm, engine temperature etc.), i've bought RHD Rover 75 sedan 96kw diesel with manual gearbox, so tried to change Ecu kit, like in this picture:





changed everything except that small black box. Car doesn't start. Should i find that black box and change also?

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