MCGRATH RENTCORP <MGRC> SEES NET RISING McGrath RentCorp said as a result of its December acquisition of Space Co, it expects earnings per share in 1987 of 1.15 to 1.30 dlrs per share, up from 70 cts in 1986. The company said pretax net should rise to nine to 10 mln dlrs from six mln dlrs in 1986 and rental operation revenues to 19 to 22 mln dlrs from 12.5 mln dlrs. It said cash flow per share this year should be 2.50 to three dlrs.