How to set timing on 1995 gmc sierra
use inductive timing light, hook up to battery, place clamp over #1 plug wire, clean off timing marks on damper, & metal plate @ damper (crankshaft) area. timing connector ? I do believe there is a EST ,electronic spark timing system, that needs unpluged, may be on firewall, near distributor, next to fuel pump relay, like my gmc, not sure about yours, then you can start timing procedure, make sure your timing marks are cleaned and rub chalk on them to highlight for better viewing . a repair manual @ parts store shows you exactly for 1995.
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