What is it? If you plan on running a Water Injection Valve with a GM HEI distributor, you must use one of these.

Why? The Tach. signal provided by GM HEI ignitions is not compatible with Banderlog Water Injection Valves. The Banderlog HEI Signal Converter converts this HEI Tach signal into a compatible signal for the Water Injection Valve.

Installation is very straight forward. There are only four connections to hook up. Power, ground, Tach. signal In and Tach. signal out.

What does this converter actually do? You don't need to know. Really, you don't. You really want to know? Ok.. Basically the converter transforms the Tach signal from a GM HEI distributor into a 12 volt square wave. When the ignition is firing, the converter outputs 0 volts. When the ignition is doing anything else, it outputs a12 Volt signal. Basically the cats meow when it comes to hooking processors up to GM engines to control things of this and that nature. How much can it power? Not all that much. If you hook a 12 Volt panel light one side the Tach output and the other to 12 Volts, it should blink whenever the engine fires a cylinder.

The logic :
Tach. in > 24 Volts, Tach. output = 0 Volts
Tach. in < 24 Volts, Tach. output = 12 Volts (Whatever the input power is.)