[Whaler]

Hi
Here's how my generic dash mounted switch was marked
By the way I wired it to use a momentary push button start once the key is flipped to the ignition position.

1-Batt
2-St (centre terminal) ( the one you are interested in)
3-Ign
4-Acc

If you are in doubt, just meter it out with a meter.
Remember that the batt terminal (1) is the common or path to each of the other terminals once the key is rotated to the corresponding positions
acc 4
ign 3
start 2

Ps do a search using ignition switch as a key word and you will find my thread on the same, many were helpful with the same questions re: painless

Tim