the way I do that is by using a drawing software.
like Creo parametric, which means I will have it in 3D, then I export it to DWG and do a clean up of the 2d drawing, then I get it imported in inkscape
notice that one picture is the gauge and another picture is the needle they are independent. but were created with the same drawing software so that all scaling and position is good.
it works for me perhaps you could do something similar