push button starter relay

i installed a push button starter using a relay for a starter kill from dei but am having problems with it.  for some reason it sometimes works and sometimes it doesn't i followed the instructions from the net.  it works fine on my buddy's car but doesn't with my 93 integra.  am i using the wrong relay?  are ignition kill relays spdt?  if anyone can help w/ how to relay it that would help out tremendously.  the set up i am using is as follows 87 to starter wire, 87a and 30 to ignition 2 , 85 to button, and 86 to ground.  i thought that it was possibly a starter problem but i connected everything back up to stock and i had no problem starting it.  thanks again guys and gals.

jeff, thanks...do i need to ground the relay at all or will just grounding the button work.  i am using the stock s2000 button, not the aftermarket s2000 button.  also you mentioned using 87 for ignition #1.  is  ignition #1 the one that shows power on acc. or should i use the one that shows power on the second turn of the key.   many, many, thanks.