Tic Toc Tach reading double rpm's any adjustments - Team Camaro Tech
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post #1 of 9 (permalink) Old Sep 9th, 05, 04:35 PM Thread Starter
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Tic Toc Tach reading double rpm's any adjustments

Hi All,
I have determined my Tic Toc Tach in my 68 is reading almost exactly double.
I remember when I had it out re-doing the dash I do not recall any switch for 4/6/8 cyl. It was in the car when I got it and have never seen it work until I got everything back together, i did not think they made 4 cylinder Camaros so I would expect there would not be a switch. Anybody have a ideas on adjustments or switches or what's going on?

Thanks
Ray
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post #2 of 9 (permalink) Old Sep 9th, 05, 10:20 PM
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Re: Tic Toc Tach reading double rpm's any adjustments

You are on the track about the switch. If you "could" switch it to 4 cylinders, it would read double on a V8. I can only guess there is a loose component inside that calibrates the tach to 8 cylinders. Try carefully inspecting all the components to see if there might be cold or broken solder joint.

Larry
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post #3 of 9 (permalink) Old Sep 10th, 05, 04:30 PM
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Re: Tic Toc Tach reading double rpm's any adjustments

Ray,
You did not mention anything about your ignition system, but if it is anything other than stock, there could be something there sending a "double" signal and causing the tach to read wrong. If you hook up a tune up type dwell meter / tach does it read correctly ?

Bill Koustenis
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1971 Chevelle "Heavy Chevy" original owner


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post #4 of 9 (permalink) Old Sep 10th, 05, 06:07 PM
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Re: Tic Toc Tach reading double rpm's any adjustments

Ray - I am having the same problem with the tachometer I recently installed in my 67. It also reads almost double. I have had this tach for almost twenty years and just got around to installing it this year. I am running a single point distributor. Perhaps these old tachometers have a calibration potentiometer on the circuit board?

I bet someone here knows.

Steve

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post #5 of 9 (permalink) Old Sep 11th, 05, 12:35 PM Thread Starter
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Re: Tic Toc Tach reading double rpm's any adjustments

Hi Billk and Farm Boy,

My Iginition system is stock with points, I borrowed an old tach from a buddy and rigged up so I could see both and compared readings, his reads 750 mine reads 1500 and seems to keep the ratio as I rev up, I think I remember a zero adjustment on the front of the tach but mine reads zero when not running.

Thanks
Ray
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post #6 of 9 (permalink) Old Sep 11th, 05, 12:49 PM
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Re: Tic Toc Tach reading double rpm's any adjustments

If I may interject, I would contact one of the gauge restore people out of Hemmings and ask them.. The TicTocTach is an awfully expensive piece to be playing with if you think something is wrong. Go into Hemmings and look, there are a number of people restoring gauges and they may have the inside track on what is wrong. Always better to be humble and ask a pro then to screw it up and have to bring it to them in the end anyway (personal experience )
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post #7 of 9 (permalink) Old Sep 11th, 05, 03:56 PM
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Re: Tic Toc Tach reading double rpm's any adjustments

Good idea, Amptech.

Larry
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post #8 of 9 (permalink) Old Sep 13th, 05, 04:54 AM Thread Starter
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Re: Tic Toc Tach reading double rpm's any adjustments

Thanks Amptech,

When I bring the car in for the winter that's usually major maintenance time ( this time it's new springs, front end steering parts and clutch). I'll pull the tach out and if something obvious doesn't show i'll do just that. Send it to someone that can rebuild/repair the Tach.

Thanks
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post #9 of 9 (permalink) Old Oct 18th, 05, 06:05 PM
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Re: Tic Toc Tach reading double rpm's any adjustments

I just finished adjusting the tach in my 67 and it works great! These old tachometers have a calibration potentiometer on the circuit board that can be accessed through a hole in the back of the tach. If you remove the tach like I did you will need to hook up two wires and ground the unit. Be sure to use a plastic screwdriver to make the adjustment to avoid shorting out the circuits inside the tach. You can get a small plastic screwdriver at Radio Shack.




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Last edited by Farm Boy; Oct 19th, 05 at 08:22 AM.
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