how close do resistors have to be to oem?

In a 2006 G. Cherokee...

The 1084.pdf states 560ohm and 150ohm resistors required for the second start and acc'y relays --

1) Can I use 1/4 watt resistors? or do I need > 1/2 watt resistors

2) The resistors I can obtain are from Radioshack and have only a 5% tolerance -- so when I put a few in series to make the right resistant (R_t = R_1 + R_2) or v.v. and put a few in parallel (1/Rt = 1/r1 + 1/r2) -- i figured i'm also factoring in a larger tolerance using multiple resistors to make the right total resistance in the circuit.

3) For those out there -- are the 5% tolerance Radioshack resistors ok?  Also, if I decided to use a potentiometer to help "dial in" the perfect resistance -- can I use a 5K ohm audio-potentiometer from Radioshack?  I would prefer a linear pot. but all they have are the 5K audio pot's. 

Thanks

Thanks for the reply ... let me clarify about the "take over mode"

Newer cars have a feature where you just tap the key to the III or "Crank" position and it'll start the car on it's own -- i.e. you do not need to "hold" the key in the crank position long enough to hear that you've started the engine. I know Benz's have this, new Infiniti's and Acuras as well.  It's basically like a Push button start, but instead of having an OEM Start button on the dash, you have to turn the key and tap the "Crank" position to do the same thing