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The Terminator
Engine/Tuning
Tach signal tap
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<blockquote data-quote="IUP99snake" data-source="post: 13389524" data-attributes="member: 7060"><p>You'll need a tach adapter unless your device has a programmable tach input. If that is the case, set it to .5 pulses per revolution-- On a 4 stroke engine, the injectors and coils fire once for every two revolutions. </p><p></p><p>I recommend tapping into an injector instead of a coil. Here's why: The factory ignition will produce multiple sparks per firing stroke under 3000 RPM. This creates a tach reading 2 or 3 times higher than it should be. You could be at 2500 RPM but the device will read 5000 RPM's instead. That could cause problems if your window switch is set below 5000 RPM. </p><p></p><p>Unlike the coils, the injectors will always produce a tach signal of .5 pulses per revolution. You can tap into the positive lead of any injector. </p><p></p><p>This trick works great on my AEM Wideband Failsafe gauge.</p></blockquote><p></p>
[QUOTE="IUP99snake, post: 13389524, member: 7060"] You'll need a tach adapter unless your device has a programmable tach input. If that is the case, set it to .5 pulses per revolution-- On a 4 stroke engine, the injectors and coils fire once for every two revolutions. I recommend tapping into an injector instead of a coil. Here's why: The factory ignition will produce multiple sparks per firing stroke under 3000 RPM. This creates a tach reading 2 or 3 times higher than it should be. You could be at 2500 RPM but the device will read 5000 RPM's instead. That could cause problems if your window switch is set below 5000 RPM. Unlike the coils, the injectors will always produce a tach signal of .5 pulses per revolution. You can tap into the positive lead of any injector. This trick works great on my AEM Wideband Failsafe gauge. [/QUOTE]
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