Buy the resistor for less than a dollar at Radio Shack. Notice the ZZP PCM requirement? They're ignoring the Map sensor input to run it in 'obd1 mode' like the Series 1'* so the IAT will advance timing (like the happy **** I custom built last year).
OBD1 doesn't use a MAP input in conjunction with the IAT signal to determine timing advance. So you can trick the IAT to gain a limited amount of power. My experiments with the Zilla have shown 3 degrees of advance possible under load. If the ZZP PCM ignores the MAP signal in calculating timing advance, this pellet will trick the IAT into thinking the incoming air is colder and denser, and will increase timing.
So why would you want to invest 19.99 for a resistor when you can buy it at Radio Shack for a dollar, and determine which one you should buy (remember colder air) by reading this Techinfo article:
No offense intended to the topic author, but it chaps my hide when I see crap like this. Now you know.
Notice it says MINUS 30 degrees C?
That pellet has a resistor in it somewhere in the range of of 28kohms or 28000 ohms. So a 20k and an 8k resistor in series will do.
Dontcha just love a moneymaking scam?
Running that cold of a sensor spoof, you better follow their well-founded advice and run 100 octane fuel, or we'll have to add you to our BOOM department and hall of fame.
ALL PCM'* will gain timing if you add a basic OBD1-type MAP table to them in place of the MAP sensor input.
This is why the happy **** for OBD2 has to be pre-programmed into the PCM and it doesn't on the OBD1 if you have a little creative genius.
I suggest ditching the ZZP PCM, and not wasting your money on a 20 dollar resistor, and getting the INTENSE PCM with the happy **** option so that you can actually TUNE your car, and see what timing it will tolerate, via information from your scantool. You will not be so heavily dependent on super-de-dooperly high octane and a fixed IAT value.