Where is the tach signal on the ignition coil?
The most common locations for a tach signal are the negative terminal of the ignition coil or tachometer output terminal (HEI, Ignition Control Boxes or ECU). Verify 12V ACC, signal and ground connections (see above).
Can a low voltage ECU drive a tachometer?
Many ECU outputs are low voltage (4-5V) which will not drive the tachometer without modification. If you have a low voltage (4-5V) tachometer signal you can install a 680 ohm “pull up” resister from the 12V gauge power wire (ACC) to the signal wire to increase the signal strength.
How do you install a coil on a tachometer?
Crimp another connector to the black wire, and install it on bare metal, under the dash, such as the steering column mount. Use a wrench to loosen a nut or sheet-metal screw that is located on bare metal, and install the wire. Run the remaining wire through the firewall, underneath the dash, and into the engine compartment.
Where to put a tach signal on a battery?
We recommend using the same location as the battery negative terminal ground. Verify you are using a proper signal source. The most common locations for a tach signal are the negative terminal of the ignition coil or tachometer output terminal (HEI, Ignition Control Boxes or ECU). Verify 12V ACC, signal and ground connections (see above).
How do you connect a tachometer to an ignition coil?
Route the wire, so that it does not chafe against metal and short. Attach the wire to the negative side of the engine ignition coil. Crimp a connector that will fit onto the coil terminal, and secure it, tightly, with a wrench. Start the car, and test the tachometer operation.
Many ECU outputs are low voltage (4-5V) which will not drive the tachometer without modification. If you have a low voltage (4-5V) tachometer signal you can install a 680 ohm “pull up” resister from the 12V gauge power wire (ACC) to the signal wire to increase the signal strength.
What kind of wire do I need to hook up my tachometer?
Use the SIG 1 (In-Dash Tach) or purple wire (Pedestal Mount Tach) input (see “Signal Hookup” in the instructions). If you have a modern ignition system and your ECU (computer) has a dedicated 12V tachometer signal output you can use this to drive the tachometer.
We recommend using the same location as the battery negative terminal ground. Verify you are using a proper signal source. The most common locations for a tach signal are the negative terminal of the ignition coil or tachometer output terminal (HEI, Ignition Control Boxes or ECU). Verify 12V ACC, signal and ground connections (see above).