Ok, your powered sensor puts out 0-5V so that should be okay. (But if you want to decrease the range from 0-5V to 0-4V etc, then the resistive/voltage divider applies.)
Your temp sender is a resistance. You do not measure resistance per se - you measure the voltage across it & current through it.
Instead of measuring the current (and voltage), we add a series resistor and merely measure the voltage across it....
Hence your temp sender needs another resistor placed in series and have a voltage applied....
Call the added resistor R1.
Call the temp sender R2.
Connect them between a voltage Vin.
You then measure the voltage across the temp sender R2 which is Vout. (See the Wiki voltage divider link as above.)
You need to calculate the R1 value based on (1) our temp sensor range, (2) the supply voltage Vin, & (3) your desired output voltage range Vout.
Be aware that Vin needs to be regulated. Hence you might use another regulated source or the FB's 5V etc.
The problem is that you may want a good voltage range across the temp sender which means a higher voltage supply. This is to make the added resistor as large as possible to reduce the current. (Increased current means more load on the supply (eg, FB) as well as higher resistor wattage ratings.) An alternative is to use a constant current source (typically 2 transistors and a resistor or 2).
For comparison, many vehicle temp gauges are supplied by an 8V regulated supply.
Though the above sounds complex, it's just "one bit at a time". I've given you the full byte (in a long-word).
It is application of one main thing - Ohm's Law (V=IR).
Also a bit of power ratings (P=VI) and understanding basic circuit theory that series voltages add up (to the supply voltage) and the current flowing through a path is equal through each component (which is really Ohms Law V=IR).
It's an iterative design. Set your desired temp range (and hence resistance range) and what voltage that should correspond to for your FB.
You then iterate R1 based in Vin supply voltage and source.....
... and then, more Chinese take-away programming tricks....