SmthnD1ff Posted November 27, 2013 Share Posted November 27, 2013 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? Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted November 27, 2013 Share Posted November 27, 2013 Bad tach in the cluster you got. Get another one. This is all assuming the SunPro one was reading correctly before all this. Link to comment Share on other sites More sharing options...
Eagle Posted November 27, 2013 Share Posted November 27, 2013 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. Link to comment Share on other sites More sharing options...
SmthnD1ff Posted November 27, 2013 Author Share Posted November 27, 2013 well that was the first thing i did but it didnt work Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 27, 2013 Share Posted November 27, 2013 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. Link to comment Share on other sites More sharing options...
SmthnD1ff Posted November 27, 2013 Author Share Posted November 27, 2013 I did all my testing with the tach out of the cluster and verified signal from the ICM. Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 27, 2013 Share Posted November 27, 2013 Wonderful. Link to comment Share on other sites More sharing options...
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