You need the optional Up/Down switches, and if possible

• A display or
• A PC with RS232 communication and the communication harness

These are some guidelines for various tank mixtures:

The display wiring and operation is a little crazy.

The unit can display the following items. One can be selected by shorting the ‘select wire’ (pin 2) to +12 Volts momentarily.

FUEL ADDITION

This is the fuel addition from the manual adjust or the automatic adjustment. The reading is in percent. If you are checking the injector open times, then you will notice that the injector ‘sluggish’ open time is recognized.

INJECTOR UTILIZATION

This is a very important measurement. It describes the duty cycle of the injectors. At 100% you can’t add more fuel because the injectors are constantly on. The engine will run LEAN at this point. This can happen only at full power and high RPM. The engine may be damaged if you are operating at 100% for any length of time.

NARROW BAND AFR

This is the AFR as measured on the NAFRIN input. A ZERO indicates that the input is not recognized.

WIDE BAND AFR

This is the wide band AFR reading from the BOSCH LSU-4 probe connected to the NAFRIN and the WAFRIN input pins. A ZERO indicates that the input is not recognized. The unit checks the NAFRIN input first, and if it is OK will ignore the WAFRIN.

ENGINE TEMPERATURE

This is the engine temperature reading from the optional probe. A disconnected or malfunctioning probe will be displayed in the software as red and will read 010°C

FUEL ADDITION (TOTAL)

This is the total amount of fuel added in percent. It includes the cold start enrichment.

COLD START ENRICHMENT

This is the cold start enrichment fuel added to the injection in percent.

ECU INJECTION, MILLISECONDS

This is the ECU injection length in milliseconds.