99 Suburban K1500 5.7L

I’ve replaced both coolant sensors and the thermostat. I’ve purged the system of air. Coolant temp gauge is still reading low at the first quarter mark. It should be right at 210 mark under normal conditions correct?

I just had the instrument cluster rebuilt.

I’m thinking it’s gotta be the gauge still. Thinking I should take it back to the shop and have them redo it. What yall think?

Edit: on the instrument cluster, all the gauges (oil, volt, coolant, fuel) should rest at 0 (all the way to left) with ignition key off correct? They shouldn’t remain at the last reading when truck was running?