better:
if totalHD ≥ 1024 then
set totalHD to totalHD / 1024
set usedHD to usedHD / 1024
set totalHD to round_truncate(totalHD, 2)
set usedHD to round_truncate(usedHD, 2)
set HDstring to HDname & ": " & usedHD & "/" & totalHD & " TB (" & HDpercent & "%) " & HDBar as string
else
set HDstring to HDname & ": " & usedHD & "/" & totalHD & " GB (" & HDpercent & "%) " & HDBar as string
end if

and towards the bottom where you put the HD size:

if totalHD ≥ 1024 then
set totalHD to totalHD / 1024
set totalHD to round_truncate(totalHD, 2)
set HDstring to HDname & ": " & usedHD & "/" & totalHD & " TB (" & HDpercent & "%) " & HDBar as string
else
set HDstring to HDname & ": " & usedHD & "/" & totalHD & " GB (" & HDpercent & "%) " & HDBar as string
end if

one other change:
line 20:

set memtotal to do shell script "sysctl -n hw.memsize"

Line 64 in 'thebenning.scpt' typecasts what can be a very large number to an int I have over 10gigs of ram, so switching it to cast the value as a number fixed it for me.

Damn. Got really excited hoping this might work on my MacPro but still nothing..
If there was source maybe I could help make this compatible with the Xeons too?