1993 Chevy Astro dash cluster

I pulled the dash cluster out and replaced the six larger bulbs to light up speedometer, fuel, charging, temp- checked existing bulbs with meter and they seemed good- the turn signal indicators work, check engine light works brake warning works- general dash lights have never worked in 2 yrs I owned van is there a fuse not in place? What powers the dash cluster -i assume I have power because of turn sig. And such is there a separate power supply built in to the cluster I have gauges for temp, charging, fuel, volts but can't see mph, fuel, volts, charging at night what should I check