1998 Isuzu Hombre Q&A

1998 Isuzu Hombre Question: why would i have no heat and my temperature gauge not work on my 98 isuzu hombre

I just changed the water pump, thermostat and temperature switch because I had a leak and was told it was the water pump. I have no leak now but my heat is still not working and neither is my temperature gauge. WHY??? Please help -
Answer 1
Why , Because it wasn't diagnosed properly? Was the temp. guage working before? If so, make sure it's plugged in and no wire damage. Thermostat installed correctly , and system was allowed to warm up and purge all air out of system??? Air trapped in system will cause a no-heat condition sometimes. -
Answer 2
possible air in system; possible broken/disconnected CTS or wire. -