I have decided to rebuild the truck and remove the box off the rear behind the cab and replace the Tamiya MFU with a servonaut M20+ because the pump runs at 12V and it is playing havoc with the electrics trying to operate the pump at 12v and run the MFU at 7.2v
all I have done at the moment is swapped the running gear and fitted a single speed gearbox to the truck because I may not have enough channels on the planet T7 radio so I may have to get another TX/RX with more channels and the servonaut speed controllers is controlled very differently to a Tamiya trucks MFU LOL