Add a tachometer-electronic iginition


Old 10-31-07, 03:03 PM
Thread Starter
Join Date: Feb 2002
Location: USA
Posts: 86
Add a tachometer-electronic iginition

Just for fun. I want to add a tachometer to a vehicle(s) with electronic ignition. The older "normal" autos it is only required to attach the "tach pickup" to the negative side of the coil. Since the electronic ignition systems now use "transistorized" or "capacitor" discharge--how do I determine the correct wire to connect to the "tach pickup"? Would the source be from the coil or from the distributor?

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Old 11-01-07, 09:41 AM
redshift's Avatar
Join Date: Oct 2007
Location: USA
Posts: 14
I would probably source the signal from the distributor. When you hook up a timing light you always use one of the plug wires, so that seems like the most reliable place to grab a signal for an external tach.
Old 11-01-07, 10:36 AM
Join Date: Jan 2007
Location: Central Indiana
Posts: 389
Most electronic ignition modules have a 'tach wire'. You just need a good electrical schematic of the vehicle wiring to find it. Some libraries have a set of vehicle schematics published by Motors Manuals (name??) or something close to that. Maybe an automotive book on ignition systems would be a source as well. Good luck.

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