The RHD Montréal’s must have had Imperial instruments.
In looking through 'M-tEC' there are several shots of speedometers in both Right Hand Drive Montréal’s (p. 28) and LHD cars (pgs. 38, 39 & 37). All of them appear to have the Km/hour X 10 speedo faces. I have yet to see a Montreal with MPH speedo face. Would you post a photo if possible?