Setting the correct W4 deductions for unique situation (see below)

Both of my jobs are based out of a state that I don't live in...My wife and I live in DE but both companies that I work for are based out of PA. Because I file jointly with my wife, I have to file DE taxes because her job is DE.

 

How can I put extra money aside to pay DE taxes (pay DE taxes ahead so I don't get caught owing DE taxes at the end of the year). I don't want additional taken out of my wife's pay, I'd rather have additional taken out of my PA pay. Is this possible, if so how? Thanks