u can buy one of those crappy mv shift units that usually dont work
heheheheh
i can make a unit that will plug straight into yr crown auto and u just have to wire
afew wires up under the dash
but i always warn people that the way these units work is a pain in the buuuttt
u need to press overdrive off button then u can go thru the gears 1st then 2nd then 3rd using shifter and pushing it form 1 to 2 to 3 or d
then to get overdrive u press overdirve button so its off
then to go back ot 3rd u pressoverdrive button back on then move shifter to go from 3 to 2 to 1 then slow down and stop at lights
so u then leave it in 1st to take off
alot of people forget to go from 3rd to 1st and they try to take off and its still in 3
takes abit to get used to it