[TR] Electrical wire Q

[John Gillis]

Morning all,
here is a nice nurdy one; I ma wiring the central gauge panel in the  
dash of my TR2,  the wiring diagram shows the brown/blue (36) coming  
from the A1 terminal on the control box to the A terminal on the  
lighting switch, in my loom this is quite a heavy cable (having only  
just connected it I do not want to disconnect to count the strands),  
i.e not like lighting circuit, but more like those coming off the Amp  
meter. There is a short link cable from the same A terminal on the  
lighting switch going to the ignition switch, this is also brown/ 
blue, my question is does this cable need to be the same thickness,  
rating as the one from the control box?.
P.S If I had realised how tight it all is behind the dash I might  
have opted for no heater
Regards
John
1954 TR2