If you want to do it correctly and accurately, you
need a torque tester/calibrator.
Be prepared to spend anywhere from $1600-$1800 for one.

http://buy1.snapon.com/catalog/item...;group_ID=986&store=snapon-store


1995 Trooper LS auto 3.2 DOHC /w SOHC intake
1989 Trooper 2.6 auto
1989 I-Mark RS DOHC 1.6
1991 Stylus XS DOHC 1.8