I believe you do have the readout but not the switch. Does
your car display temperature (I think S70s GLTs do even without
the trip computer though older ones do not)? To add the trip
computer you would need the switch from a dealer and they would
have to enable the software (an extra charge in addition to
the switch). The trip computer would give you
average speed, average MPG, instant MPG, distance travelled since
reset, distance to empty, and temperature (you can only display
one of them at a time).
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