Originally Posted by TBatt

Sorry but I do not have first hand experience with the Zeitronix.

The AEM Failsafe is super easy to install and the logging feature is really nice when a problem comes up such as a bad fuel pump. I know this because it happened with me. At first he AF was ok and then slowly started going leaner and because I had proof of the problem Stillen replaced the faulty pump with no questions asked. The interface is a USB cable that I have coiled up in the glove box. It comes with a Bosch WB sensor and bung. When I had Fast Intentions make my CBE I had them install a WB bung for me. Worked out great. One other nice feature of the AEM gauge is that it is easily user programmed for what you want it to do. The failsafe feature lets you control whatever (from a beeper to a boost controller) with a programmable relay that you get to set the parameters to trigger it.