Help with resistors

[fstalfire]

I'm swapping an LS motor into my '71 C10....my fuel gauge apparently is 3o ohm and my new electric fuel pump is 90ohm....a search here for nfo led me to the solution that a 45ohm resistor would fix my issue...my problem now s I've never used a resistor before and when i google search a 45 ohm resistor i find ones you use in circuit boards and no info on what i'm looking for or how to connect it to my wire harness
...so, whar type of resistor do i need for automotive application?
what wattage resistor do i need?
how do you connect it to your wire harness?