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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#84924 05/12/2002 1:07 AM | Joined: Jun 2001 Posts: 379 Shop Shark | | Shop Shark Joined: Jun 2001 Posts: 379 | I picked up a "Peerless Instruments Co." tachometer (5,000 rpm) for $1.00 at my local recycle store. There are four green wires coming out the back. Is there a safe way to sort these out without frying it? I can take it apart and investigate more, but just don't want to destroy it. Are tach's generally wired downstream of the 12 to 6 volt resister? Any help would be appreciated. Thanks. :confused: | | |
#84925 05/12/2002 12:31 PM | Joined: Jan 2000 Posts: 1,586 Extreme Gabster | | Extreme Gabster Joined: Jan 2000 Posts: 1,586 | A nice find at the recycle store, its a engine tach and not some sort of industrial tach?If its a "modern" tachometer, not requiring a separate sending unit like the old Suns, then you will find a wire for the ignition switch, a wire to go on distributer side of the coil, a ground and usually a wire for the illumination.Usually it does not make a difference if you hook up the power wire at the ignition switch or after the resister on the coil itself .Eliminate the wires one by one, the ground and illumination wires should be easy to figure out.Then you have only the 2 wires left for the switched power and the points. Hook it up briefly to see how if the tach works, it won't ruin the unit if the those two wires are crossed for a moment. | | |
#84926 05/12/2002 3:32 PM | Joined: Jun 2001 Posts: 379 Shop Shark | | Shop Shark Joined: Jun 2001 Posts: 379 | Well I'm pumped up about this. It came with a chrome housing and clamp assembly to mount on the steering column. I pulled it out, and turns out that it perfectly fit into the "tach" location of a '54 gmc gauge cluster I recently scored at a swap meet. I was even able to use the bezel that was on the "gmc" plate that fills the hole where the rare option tach is supposed to go. There are two terminals for the tachometer and two wires for the light. Now to find out which one of the light wires is the ground and hook this up for a test. Thanks  | | |
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