Chris:
If you are looking for an attenuation solution that will perform well you could try a circuit like that shown below. This circuit loads your sensor with an impedance of about 420K ohms. This should result in minimal loading on the sensor. In addition the inclusion of an opamp buffer provides a buffering of the divider so that the A/D converter can be sourced from a low impedance. I have shown standard 1% resistor values that scale the signal range from 0->16 volts to very close to the 0->5 volt input range of the A/D converter in your microcontroller.



I show the opamp as one with a dual supply. This provides the most general solution of the typical opamp that must pass a signal of zero volts. The +/- Vcc level selected will depend upon the ratings and specifications of the opamp selected. There are in the market today some very fine rail-to-rail opamps that may permit the buffer to operate from a single power supply of 5 volts. The choice of selecting one of these opamp types versus the dual supply type as shown will depend on factors that include the following:

1) Cost of the buffer part
2) Availability of the dual supply voltages
3) Acceptability of some signal compression or clamping at outputs near ground or near +5 volts.

Hope this provides some good ideas.
Michael Karas