How it works.. The resistor draws down the current that is passed from the sensor, which makes the computer think that there is a lower amount of fuel being injected. To compensate for this, it ups the current more, and more fuel is injected.
Here's how to do it:
TikiWiki : 10 K Mod
The lower the value, the more it power it will create.
Since you already have a TS chip, you probably will not notice any change. Also -- you need gauges before experimenting with this...