The 1998 model has the option to swap out the factory flasher module for one of our LED flasher modules. The turn signals will function 100% correctly if you choose to install the flasher module, otherwise you'll need to install load resistors. Also, I think you will find the interior lighting kit to be one of the simplest modifications you ever make to your vehicle.
If you have any questions or need any help, feel free to shoot me a PM, or email us at: contact@diodedynamics.com
Thanks,
Nick C.