Hi Johannes
The x12 motors do seem to run much hotter than other manufacturers or even other LRP models. You arent the only one who has had trouble with heat if you read the forums.
My personal opinion is that the speedo will be fine, id just try a different manufacturer of motor for your 4WD car.
The Speed Passion V3 range are popular and have many titles under their belt. I have bought a SP V3 6.5 ready for my 201 when they are released.
Speed passion also make quality speedos too. I too use LRP/Nosram speedos and they have been good to me so ill stay with them for now and run SP motors
Hope that helps
