from the start:
1.copy your cars.wad from gp4 folder to a temp folder
2.right click and choose 'extract wad to dir'
3.a cars folder will appear and in that is 3 folder cars, fonts, maps
4.open gp4masters tex workshop (the blue button)
5.click 'Load tex file' and browse to temp/cars/cars/cockpits/new_steering_wheel_displays.tex
6.click 'replace selected' and browse to ../McLaren_wheel/new_steering_wheel_displays1.TGA
7. click 'downsample textures' and ok
8.click 'save tex file' and ok
this has replaces 1 out of 4 files. do steps 5 to 8 again for:
temp/cars/cars/stwheel.tex
temp/cars/cars/cockpits/steering_wheel_centre.tex
temp/cars/cars/cockpits/steering_wheel_ends.tex
now go into temp/ folder and delete the cars.wad. now right click on the cars folder and choose 'compress directory to .wad'
a cars.wad file will appear. this is your new wad with mclaren wheel.
copy it back to you gp4 folder.
(you should backup first by renaming the original wad in the gp4 folder to cars_old.wad. then if something goes wrong you can still use this one)
____
Tony