- HEI Distributor- Tach wiring issues??
- Problems w/Autometer Tach connection to coil...
- Installing a Tachometer to a Coil
- How to Connect a Tachometer
- GM Muscle Car Tach Voltage Requirements - Pit Stop
HEI Distributor- Tach wiring issues??A tachometer measures the number of times an engine's crank shaft rotates per minute RPM. For any engine, the RPM determines how much horsepower and torque is being produced at any given moment. Connect a tachometer to an engine and know when the engine is running at peak performance and when it may be working too hard. Too many engine revolutions will create excess heat, and reduces an engine's reliability. Protect any engine from excess wear and tear with the RPM data an easy to install tachometer can give you. Work in a well-lit area with access to the equipment you need once you have begun to connect a tachometer to your vehicle. Raise the hood and disconnect the negative battery cable from the battery and keep it from coming in contact during tachometer installation. Locate the ignition coil and clean the negative side connector and any adapters that may be present. Remove any oxidation or debris from this location where the tachometer sender wire will be secured. Find a good place to pass a wire through the firewall in front of the driver's compartment. Position the tachometer over the center of the steering column and fasten it securely using a mounting clamp and bracket fitting to the steering column of the vehicle. The tachometer will have wires coming from the back of the gauge. One is a ground wire, one is a power supply sire, and one connects the vehicle's ignition system either via the ignition coil or through an electronic connection with the vehicles computerized ignition. A system without a distributor will need to connect to the electronic ignition. Check with the gauge manufacturer for the GREEN wire connection path that suits the ignition system installed in your vehicle. The steps for the power supply and ground wires on all tachometers are the same. Tape together the wires that are protruding out the back of the gauge until the wires meet the dashboard. Secure the wires under the dashboard with tie wraps or by using existing harness paths to run the wires in conduit that houses existing wires. Find a pathway for the green wire to run through the firewall in front of the driver under the dashboard. Protect any wires from chaffing inside a firewall hole by protecting it with a rubber grommet and silicon gel. This makes the wire safe and seals the hole from the outside. Run the power supply wire to the fuse panel and tap into a fuse with a fuse tap. Find a fuse that operates on the turning of the ignition key. When the key is turned and the auxiliary power is supplied, the tachometer should also be lit for use. The ground wire must be secured in a paint free connection with the major parts of the vehicle. A great place to ground any gauge is at the mounting bracket for the pedal assemblies. Gas, brake, or clutch mounts are a great place to loosen a nut and insert a ground wire for an auxiliary component or electronic device. Tie back all loose, hanging wires from around the driver's feet area. Do not leave wires to hang when driving to prevent pulling wires from gauges, or causing an accident while driving. Connect the green wire to the negative post of the ignition coil.
Problems w/Autometer Tach connection to coil...
Installing a Tachometer to a Coil
A tachometer is a fun accessory to add to a performance car that is not difficult to install. Originally developed for steam locomotives, they are now used in the aircraft and automotive industry. A tachometer is designed to gauge the engine RPM, or revolutions per minute. For example, the crankshaft completes 3, revolutions in one minute when the tachometer needle points to "3" on the face of the gauge. The danger limits are indicated by the red-colored portion of the gauge, and it is unsafe to operate the engine at these high limits. Mount the tachometer in a convenient location, one that is easy to read. On back of the unit are three wires: a red, a black, and, usually, a green wire. Route these three wires under the dashboard. Install a terminal on the red wire, and crimp it tightly in place with a crimp tool. Install a fuse tap onto a fuse that has power with the key on, such as the radio fuse. 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. Locate an opening with a rubber grommet installed through which the wire can pass. 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. This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us. Installing a Tachometer to a Coil by Jack Hathcoat. Step 1 Mount the tachometer in a convenient location, one that is easy to read. Step 3 Run the remaining wire through the firewall, underneath the dash, and into the engine compartment. Items you will need Wire strippers Wire crimps Wrench set Fuse tap. About the Author This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.
How to Connect a Tachometer