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Xj Tach In 2.5 Renix


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I'm at a loss. When I got my truck it had an aftermarket tach zip tied to the steering column. I bought a cluster w full gauges but the wiring for the tach has stumped me. I tried reusing the green tach signal lead that was hooked up to the aftermarket sun pro tach as the signal for the OEM tach but the tach just slowly rises to lk 2500 rpm and stays there regaurdless if engine speed. Tach signal is properly hooked up to the ICM and adjusting the potentiometer on the tach makes no difference.

Any ideas?

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I'm at a loss. When I got my truck it had an aftermarket tach zip tied to the steering column. I bought a cluster w full gauges but the wiring for the tach has stumped me. I tried reusing the green tach signal lead that was hooked up to the aftermarket sun pro tach as the signal for the OEM tach but the tach just slowly rises to lk 2500 rpm and stays there regaurdless if engine speed. Tach signal is properly hooked up to the ICM and adjusting the potentiometer on the tach makes no difference.

Any ideas?

 

Why are you using any wires from the Sun tach installation? The wiring for the factory tach is already there, it's plug-n-play.

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Make sure the tach mounting screws to the cluster are tight and clean. The PC foil sometimes gets torn, so follow the traces from the tach + and - terminals along the foil to makes sure there are no obvious open circuits. You'll also need to check continuity from the cluster plug cable pins to the tach terminals, but you will need a wiring diagram for that. The gauges, including the tach, seldom go bad. It's most always the PC foil is damaged, or the tach signal isn't getting to the tach from the ICM. You would get some tach movement if there was continuity. Either way, you will need a wiring diagram to trace out continuity.

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