  We present scanning tunneling spectroscopy measurements of the local
quasiparticles' excitation spectra of CeCoIn$_5$ between 440mK and 3K in
samples with a bulk $T_{\rm c}=2.25$K. The spectral shape of our
low-temperature tunneling data, quite textbook nodal-gap conductance, allow us
to confidently fit the spectra with a d-wave density of states considering also
a shortening of quasiparticles' lifetime term $\Gamma$. The $\Delta(0)$ value
obtained from the fits yields a BCS ratio $2\Delta/kT_{\rm c} =7.73$ suggesting
that CeCoIn$_5$ is an unconventional superconductor in the strong coupling
limit. The fits also suggest that the height of coherence peaks in CeCoIn$_5$
is reduced with respect to a pure BCS spectra and therefore the coupling of
quasiparticles with spin excitations should play a relevant role. In addition,
the tunneling conductance shows a depletion at energies smaller than $\Delta$
for temperatures larger than the bulk $T_{\rm c}$, giving further support to
the existence of a pseudogap phase that in our samples span up to $T^{*}\sim
1.2 T_{\rm c}$. The phenomenological scaling of the pseudogap temperature
observed in various families of cuprates, $2\Delta/kT^{*} \sim 4.3 $, is not
fulfilled in our measurements. This suggests that in CeCoIn$_5$ the strong
magnetic fluctuations might conspire to close the local superconducting gap at
a smaller pesudogap temperature-scale than in cuprates.
