avatar sit problem

Ive written this vehicle script and added a driving pose but I can't seem to position the avatar correctly? anyone suggestions?

Sorry we've all left our telepathic script skills at home today....

For your own benefit please try to include a bit more detail as to exactly what is or isnt working, Posting code, or fragments of the code you think may be relevant, would also help.

Have you set the sit target?

I try to position the seat manually so it is at the right distance from the steer then I set the SitTarget in non physical mode but when actually seated the avatar curves a little. I was thinking on making the avatar phantom but can't seem to succeed in that. My following option I thought off was llSetLocalRot but no good either.

PHP
state_entry()
{
llSetSitText("Drive";
llSitTarget(<-.6, -.00, -.7>, <0,0,-1.0,1>;
llSetVehicleType(VEHICLE_TYPE_CAR);
/PHP

is it enough to put the llSitTargets in every seat so that the avatar will sit correctly? or does anyone needs to adjust anyways? I was wondering how that could be done from the first time, considering the length of the avatar et cetera