AEM failsafe gauge

[chrisf]

quick questions about the AEM failsafe gauge 30-4900.

Wideband Failsafe Gauge | AEM

it logs AFR, boost, and RPM. Under the specs tabs there is a spec concerning usage of the RPM functionality:

**IMPORTANT INFORMATION REGARDING USING THE RPM INPUT FOR THE WIDEBAND FAILSAFE GAUGE

The AEM Wideband Failsafe Gauge’s (WBFS) engine speed (RPM) input requires a clean square wave tachometer-type signal in order to log engine speed properly.

The voltage of this signal must NOT exceed 16V or go below vehicle ground (zero volts.)

Here are examples of signals that WILL NOT work and could cause damage to the gauge:
•Crank sensors
•Ignition coil primary (positive or negative terminal)
•Injector signals

Here are examples of suggested RPM input configurations:
•An MSD GMR Pickup (P/N #8918) connected to: coil primary (inductive or capacitive) or fuel injector*
•An aftermarket multi-strike distributor tachometer output (for example: MSD-6AL, Crane Hi-6, etc.)
•OEM tachometer signal (0-12V square wave—verification with an oscilloscope recommended)

*Note: Install the GMR Pickup as per MSD instructions; the GMR is generally installed on the “+” side of referenced signals.

If a signal’s waveform is unknown and cannot be verified with an oscilloscope, it’s safest to assume that the signal won’t work and could possibly damage the gauge. In these cases, it is suggested that the MSD GMR Pickup be utilized to pick up off of an ignition coil.

does anybody know if this is plug & play with a stock '86 3.2/DME setup?

Thanks,

~Chris

[SoyRacer]

Will work with the GMR pickup attached at the coil.

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[chrisf]

found some more info soyracer....thanks