Is your 3D Mesh too big, small or off-center? Here's what you do.
Open ALL your meshes back into ZModeler, this includes the dashboard, the wheel, the 3D brake lights (if applicable), and the needle!
Select them all with the square selector, and go to Modify... Scale
Hold Shift, and drag the mouse to scale up or down, depending on your needs!
Once they're aligned, export your meshes, but keep ZModeler open!
Pack the car and go test drive.
Almost got it, now I just have to move the car a bit back and scale down a little.
Keep doing this until the model lines up perfectly.
Once you are lined up, you can move ONWARD.