Novak GTB/Spektrum

[Belsten]

I have just plumped for spektrum and have realised Novak do 2 versions of the GTB. One normal and one spektrum spread. I have the ordinary GTB's and could really do without the expense of replacing 2 speedos. Is it necessary to get the spektrum spread speedos or will my existing ones be ok ? The only difference I can tell between the 2 is the faster switching speeds on the spektrum ones, hence increased performance & cooler motors. Thanks