I running a 1991 season, and this is what i did to the steering wheel
I´m using the steera*.jam dsh1 and dsh2 files of the 90 steering, and the the dsh3big of the 93 ferrari steering wheel of the king of the panza.
First you must use the GP3CE, and install the 93 ferrari wheel(there are two versions, with speed and fuel data and without), and after you replace the steerac*.jam and the dsh1*.jam dsh2*.jam
note1: these two files have a kind an very primary lcd screen wich stays behind the steering wheel.
note 2: you have to use the cpthi3*.bmp of the king of the panza to have the lcd working properly otherwise with won´t work, and, if you want, using a image editor, like Paint Shop Pro, you can replace the wheel center(lcd screen position) of the 93 Ferrari to the 90´s MOMO wheel.
I hope it can help you!