climate control unit change?

hi i got a 1994 98 regency that my dad had gotten form his aunt and it has a electronic climate control and right now it says degrees Celsius and i want to switch it to Fahrenheit? i read in the owners manual about electronic dashes having a button but this dash is analog and now buttons. how would i go about switching this?

No owner's manual? I wonder if this is a Canadian model?

well it does have a owners manual but it only says how to switch if you have a digital dash. unless i missed something. but i do not see anything about it being made in canada. they could have had the unit installed after they purchased it