I am using a 88 van harness in my L body. This is a non-computer auto tranny harness. There are 2 plugs that went to the transmission. As I recall, the 3.wire plug from the top of the tranny is rewired to 2 and used on the 5 speed (reverse?)the third is grounded(?) but what of the other 2 wire that can from near the dipstick?