If engine is off it will always give a code 12 indicating no DRP-distr ref pulse from the ignition module.
Laptop data log software is free and you can build a cable for about $6 with RS parts and then use a serial to USB adapter to connect to laptop or just buy a USB ready made cable for about $30.
Every system should be custom tuned to the engine/location for optimized performance and MPGs.
But the basic system will start and run just about any engine just like rolling of the assembly line. One size fit all.
The GM system can self correct for about 10% error in the fuel table as it is driven. normally about 50+ miles. The timing table will remain unchanged unless running a knock sensor, then it will retard the timing if ping is detected.
But you can bump the distr base timing to gain a little more or less depending on ping.
HTH
