The arrangement of the wiring on the 14-point instrument cluster is
different between model years and some US/Canadian models.

If you have the Bentley Manual, and know the model year for the new
cluster you have, you could compare the wiring schematics.

It also may be that the LED in the new cluster's temp gauge is burnt out.
Maybe you could swap temp gauges with the one from your old cluster. Does
the temp gauge needle in the new cluster work correctly?

Michael

88 Doka Transporter
89 Doka Syncro Jagdwagen
90 Syncro Camper GL
93 EV MV 5-spd
99 EV GLS
99 Rialta HD