coolant sensor mod

[MetroMPG]

the elegance of the above approach is it's fully automatic, and relatively self-limiting.

the down-sides are that it's (a) non-adjustable on the fly, and (b) the "warm" engine temp isn't 100% accurate (though if you're just going by the temp gauge, he says it's in the usual position).

my idea was to do this mod using a variable resistor - potentiometer - in place of the second WTS/resistor combo.

that way i can fully dial in as much or as little "heat" as i want the PCM to see, and then switch it off once actually warmed up, to revert to the "un-modified" coolant temp signal.

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but i'm no electronics expert. (i never had any electrical classes at school.) if you have a look at the thread on the teamswift site, you'll see me asking some pretty basic questions, as i learned about how this mod works. in particular, i needed to understand the difference between resistors wired in parallel vs. series. (one halves, the other doubles the sum of the values of the resistors, assuming equal value resistors).

i have a decent grasp now, but could use some help with the potentiometer idea. i've already scrounged one to test, plus a switch to take it in/out of the circuit, but could use some help if there are any electronics gurus here.

anyone, anyone?

i'm looking to clarify the wiring before i try it out.