Racing Tach How do i hook it up????

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Racing Tach How do i hook it up???? - 3/30/2007 2:11:48 PM    loudintrepid   Posts: 4 Joined: 3/16/2007 Status: offline ok i thought a nce big racing tach would look good in a intrepid lol ok but the instructions say to hook these wires up  to these places Black --- Ground White --- Light source Red --- 12V Switch on(when u start the car thats when it sends power to the tach) Green --- To Tach Source, either distributor (my car is distributor less.) so i tryed hooking it up to the wires that plug in to the original gauges. but still nothing. so now im lost.. could anyone tell me which wire i would hook up where? im mostly lost with the green wire. chris Post #: 1

RE: Racing Tach How do i hook it up???? - 3/30/2007 10:44:29 PM    kurts2   Posts: 591 Joined: 10/27/2006 Status: offline OK for TAC source (green) you said either the distributor or... what was the other source?  As for how it works, in the old days (prior to computers) they were basically frequency meters.  The reason to hook it up to the distributor was as the pulse signal drawed power, it caused a fluctuation in the power (a freq) that could be translated as RPM. Now it's computer controlled.  Here is a quote for the TACH out of a current manual: TACHOMETER DESCRIPTION Refer to Electrical, Instrument Cluster, Description for more information. OPERATION The tachometer receives its information across the PCI Bus from the Body Control Module (BCM). Information on engine RPM is transmitted from the Powertrain Control Module (PCM) across the PCI Bus to the BCM. The BCM calculates the position of the tachometer pointer based on the input from the PCM and adjusts the position of the gauge pointer to the necessary position. This signal is sent over the PCI Bus to the instrument cluster. In a nutshell, the PCI bus is a computer communication system.  If the TACH you bought isn't meant for this type of interface, I don't think you can hook it up to a “distributorless system”.  That is unless they mention another method to hook up that green wire. (in reply to loudintrepid) Post #: 2

RE: Racing Tach How do i hook it up???? - 3/31/2007 9:19:43 AM    loudintrepid   Posts: 4 Joined: 3/16/2007 Status: offline it does say that "this gauge can be hooked up to a distibutorless system" (in reply to kurts2) Post #: 3

RE: Racing Tach How do i hook it up???? - 4/2/2007 12:57:40 AM    kurts2   Posts: 591 Joined: 10/27/2006 Status: offline Cool!  Follow it's instructions then and it should work fine. (in reply to loudintrepid) Post #: 4

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