temp. gauge

my temp gauge doesn't have a reading could it be my thermostat or wiring.?

Gauge, sender, wire, loose connection ...
More details please - year, digi vs analog, stock etc ...

I would discount the thermostat if you otherwise have heat. The obvious place to check would be the connection at the temp sensor. You don't say what engine you have so I can't specify where your sensor is.

its a ca20  stock analog dash haven't been able to check the connection, would i have to tare my entire dash off to check the connections.? or is there and easier way.?
1987 xe all stock

Connection that goes bad is usually the plug at the motor; plastic gets brittle and falls apart. On my 85, there are two temp sensors, one for the gauge, one for the ecu. That's where I would look 1st.