Welcome. Being not the most familiar with the dash pack you are talking about, my suggestion would be to find a wiring diagram, test for good voltage and make sure grounds are clean/secure. Aside from that, find a wrecked sled or call a bone yard and get a new dash/gauge set-up shipped in. As far as aftermarket, not sure how they hook into the existing harness without some serious wiring alterations. Good luck and keep us posted.