TwEECer:
Here are some pictures of the TwEECer programmable chip. This allows you to take full control of the EEC-IV processor. Hundreds of parameters can be altered ranging from fuel and spark curves, to engine displacement, idle speed, injector size, enable electric fan drive, emissions control, etc. The chip itself plugs in to the back "J3" calibration port on the processor. Using a laptop (or desktop using a power supply) computer, you send data to the TwEECer chip. When the key is turned to the on position, the EEC looks to see if there is anything on the J3 port. If there is, it substitutes that information for the normal information stored inside the EEC. One cool aspect of this, is the EEC constantly reads the J3 port. And because the TwEECer supports 4 memory locations (and comes with a switch to change between them), you can literally change tunes WHILE driving! For example: say you have memory 1 set with an idle of 650 rpm, and memory 2 with an idle of 900 rpm. By switching between the memories, the engine will instantly change idle to the corresponding value! Here's a few pictures of the TwEECer, and the software (CalEdit) that allows you to adjust the different parameters:

Data Logging:
So far, to monitor engine parameters I have been using a cheap Dataq starter kit. It is available for $25 from them, and serves very well for logging up to 4 channels of data. Already it has told me of issues with A/F ratio during the start of WOT runs. Using an old "sandwhich" type chip, I tapped into the necessary signals at the EEC, and fed them into the data logger. Here's a picture of the data logging connector, and a log of a WOT run, showing both oxygen sensor outputs, MAF (Mass air flow meter), and TPS (throttle position sensor):