I need to find out what pellet my key has, but my multi meter has 4 different "things" to choose from in the OHM section. They are 200 2K 200K and 20M. The only one I'm getting any kind of reading from is the one marked 200K, all the other just read 0 The messed up thing is that it says 3.0. I thought the lowest number was 392?
Can somebody help me with this? I thought with a multi meter I could find the resistance. The right resistance I mean.

Your multimeter does not have auto-ranging. No big deal though.

Those numbers (200 2K 200K and 20M) are the max resistance the unit can read at that setting. If it is displaying "0" this means that the resistance is beyond that range. For instance, if you try to read a 1000 ohm resistor with the meter set at 200, it would display 0 as it has exceeded the 200 ohms scale. Simply click up to the next range (2K) and it will display something like .998K or 1.02K depending on the tollerance of the resistor. The VATS keys go up to 11K so you might even have to click up one more to the 200K scale.

Thanks very much for the help, I think I understand it. So, with it reading 3.0 in the 200k section that would mean I have the 3010 pellet?

Yep. You got it. Ususally the displays on a multimeter have three digits so I would expect to see 3.01 or something close to that but it is within the +/-5% tolerance.

I found somewhere to get some resistors (a TV repair shop). The guy there was really nice about trying to help me out. He said if the doesn't have that resistor he could make something up for me.
Now that I know the resitance I'm looking for another curve ball gets thrown at me. He says I need to know the wattage. Shoot I have no idea, I guess they come in different wattages? Anywhere from 1/8-2 (whatever those #'* mean I have no idea). Does anybody know what I should ask him for?

Watts in this case are basically heat based. Resistance causes heat (wattage) or vice versa depending on how you look at it.

Anywho, the wattage of the resistor will depend on the mount of electricity (amps) that are going through it. Not knowing for sure, but based on the size of the pellet, you wouldn't need a very high watt resistor for this project. Probably less than 1

1/4 watt resistors will do just fine.