Thank you for your message. Unfortunately, I don't think that I can be of much help.
I haven't come across any Gales in my Jehu family tree. A surprising number of people - especially in the US - have christened their sons 'Jehu' so I think it is a little dangerous to ASSUME in your case that this was an indication of a Jehu surname in the family. It could be, of course, as my own full name is Kenneth John Jehu Milton, in acknowledgement of my mother's maiden name!
You don't give any dates for your ancestors. If they were around after 1837, have you tried looking for Gale marriages on the FreeBMD website?
Season's Greetings and good luck with your family research in 2012!