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In 1996, Chrysler Jeep rolled out a more advanced version of their in-vehicle network called the Controller Area Network Bus, or CAN Bus system, over which data is shared between various electronic modules in the Jeep. One of those modules is the Jeep gauge cluster which uses a microcontroller to run the gauges.

Product & Features


Jeep:

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One largely successful strategy in retaining the factory gauges has been to keep the Jeep Powertrain Control Module (PCM) connected to the network as nothing more than a gauge mule, which is good for every gauge in the cluster except the tachometer, until now...

The Tachometer Emulator Module

Novak has developed this innovative emulator module that receives the tachometer output from a GM Generation III PCM. It then outputs the correct Crank Position (CKP) pulses to the Jeep PCM which then calculates the engine RPM's to be transmitted on the CAN bus to the Jeep gauge module.

This emulator module is built using an industrial duty processor making thousands of calculations per second to properly mimic the pulsetrain needed by the Jeep PCM to calculate and relay engine speed.

Applications & Compatibility

Versions

Jeep PCM's come in a few versions depending on the engine and model years of the Jeep. Choose the proper application to the right depending on your XJ, TJ or JK Jeep and its original engine.

GM Gen IV Caveat

The GM Gen IV PCM does not put out the same strong signal as the Gen III PCM's. As of this writing, we recommend this product only for Gen III PCM's.

Related Products

While there are many quality companies that offer PCM programming, we highly recommend that you utilize Novak's high-quality rewire and PCM programming service for maximum compatability with our Tachometer Emulators.


Installation Requirements

Installation

Installation requires that the installer be able to competently join the wire leads to the existing Jeep wiring harness as directed in the instructions. This is best done with solder and thermal shrink wrap, followed up by wire loom. Physical installation into the Jeep engine bay is easy using the mounting tabs on the case of the module. Drilling is required.

Pull-up Resistor

Before puchasing a tach emulator please confirm if your harness includes a tach pull-up resistor. You must have one installed in your Jeep or you will get strange tachometer readings. The pull-up resistor simulates the power signal from a distributor hub, and ensures a powerful, clean signal to your tach emulator, and gauges. Customers who have purhcased a Novak Jeep wiring harness from us will have a pull-up resistor installed as part of the wiring harness service.

GM Gen IV Caveat

The GM Gen IV PCM does not put out the same strong signal as the Gen III PCM's. As of this writing, we recommend this product only for Gen III PCM's.