The KDE 'task manager' is actually two programs: ksysguard and ksysguardd, the first of which is the GUI and the latter a daemon.

I tried to install them using:
# apt-get install ksysguard ksysguardd

but apt said:
ksysguardd: Depends: libsensors-1debian1 but it is not installable

in fact, when trying:
# apt-get install libsensors-1debian1

apt said:
Package libsensors-1debian1 has no available version, but exists in the database.
This typically means that the package was mentioned in a dependency and
never uploaded, has been obsoleted or is not available with the contents
of sources.list

Does anyone know to get ksysgaurd installed on 3.3?

dageek