I used to run a B4 with a Hobbywing 120 speedo. To start with I didn't just the fan (just unscrewed it) and made sure I had some air holes for ventilated as normal. I was running a 7.5t motor and everything kept pretty cool.
However when I did change the body, to one of the FTW forward cab versions everything fitted perfectly under the shell.
I personally wouldn't cut a hole in the shell and have the speedo poking out, its asking for trouble.
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Team C TM2 | Three Counties Radio Controlled Motorsport Club - www.tcrcmc.co.uk
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