Which preposition to use with pronto

for Occurrences 2%

"You damned yellow heathen," he said in a level voice, "if you ever play that trick on that cat again th' Quarter Circle KT will be shy a cook an' your ghost'll be headin' pronto for China!"

in Occurrences 1%

"All right, son, you'll meet him pronto in the Sour Creek jail, unless the boys finish their party of the other day and string you up before you get inside the jail.

on Occurrences 1%

And here I am, pretty pronto on the dot, I figure."

Which preposition to use with  pronto