Forgot to mention i was using brushed in it
.. But looking closer there doesnt appear to be a great deal of room actually thinking on that basis of using the LRP / Nosram / Novak Brushless systems in it.
I dont think there would even be an option of mounting the servo flat and using the space there to mount the speedo if i were to used Brushless in it without a heatsink as the weight would be off balance?