neutral reverse switch or what ?? help

the pic isnt that great but, the bottom left is the yellow wire you speak of.the bottom right is grounded(although it doesnt appear to be that good of a ground) the middle and the top is where i have to jump it with a screwdriver. the two prong connector where i unplugged the 3 speed transmission, do i need to do something with that? or it just for the reverse lights? do i need to replace the relay with one for an automatic or does it matter as long as this one is grounded? sorry for the questions but im at a loss here. is it ok to just wire a push button start between the top and middle terminals?does it matter if the clutch is to the floor or in its normal position? by the way i turned the key just now and nothing. i have power to everything but the key,and thank you for your help!