Hey guys. Coolant gauge currently showing 1 hatch mark below half on the coolant gauge. Does this indicate that my thermostat has failed? I checked with the scan gauge to confirm coolant temperature was 161°F. That seems a bit cold to me. Would an inline
Thermostat be beneficial at this point in time?

Yes. Its like $12 on amazon for the stant inline and it will push it up to the 190-195° range. Its a bit of a band-aid mod but it looks like we may have a new option coming up here soon so it will hold you over until you want to do something more substantial.

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2006 CRD - GTB2056 turbo by Dieselguy86, Eco Trans Tune, Lift Pump, Week's, HDS Tstat, Racor Filter, ARP's, OME 790's+Top Plate, JBA 2.5", JBA UCA, Moab's+265/75R16, ARB Bull Bar, 4.10's, TrueTracs