Dear sav455,
A reasonably accurate correction ( without considering the orifice and pipe dia variation due to temperature) is as follows:
You need the following inputs for liquid :
1. The design density ( at design op temperature)
2. The actual liquid density at standard temperature.
3.The actual temperature at the orifice.
Calculation:
1. Calculate the actual liquid density at the actual temperature at the orice using standard tables.
2. Calculate the correction factor as
Sqrt( actual density at orifice at operating temp/ design density at design temp used in meter)
3. Use this factor to multiply the indicated flow.
In case you need to correct for Gas, ask again.
Best wishes