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Old 11-06-2021, 03:54 AM
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Default Opinions on reproduction in dash tach

My GTO didn't come with a tach ... was thinking about a reproduction in dash tach like offered by our hosts. I will be using a point ignition. I don't need to have a Rally dash PCB do I?

Any opinions on these tachs?

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Old 11-06-2021, 04:43 PM
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Don't know what PCB is but I have one of these tachs in my car and it works great. My only complaint is that it's dull at night but that might be unrelated.

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Old 11-06-2021, 04:44 PM
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Printed circuit board?

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Old 11-06-2021, 04:47 PM
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Yes, there are two different PCBs for either rally or standard gauges. Was wondering if the reproduction tachs required a rally type PCB or a standard.

Now that I think about it ... I don't think the PCB would extend over to the clock/tach slot anyway.

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Old 11-06-2021, 05:07 PM
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AFAIK the two different tachs were for transistor/electronic vs points ignition and date back to 1963 (Delcotronic). For a points ignition a simple passive circuit was enough but for an electronic ignition a transistor front end was added to the same circuit.

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Old 11-06-2021, 05:32 PM
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I’ve used the aftermarket (PY) tach with both points distributor (w/ Pertronics) and HEI distributor and it works fine. The PCB IIRC is not part of the dash tach or clock. It’s a stand-alone and not part of the Speedo and gauge cluster

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Old 11-07-2021, 01:07 AM
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Confirmed, the clock and tach are stand alone units. The printed circuit board is for the speedo and oil/fuel/temp cluster.

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Old 11-08-2021, 12:39 PM
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my opinion: they're trash as far as aesthetic quality. functionally it worked. visually, it's horrible. maybe they've gotten better since I bought mine around 09. it had a black ABS case instead of metal so you can't use a factory light harness on it since the housing doesn't ground. at night it was black and you couldn't see crap, the lights did nothing for it. it was so dim I initially thought the lights weren't working. super noticeably different than the instrument cluster's brightness. it didn't fit very well in the pod hole so you could see edges all the way around it after you spent an hour trying to center it. it also had slopped silicone exposed where they glued the face into the housing.

I hated it from the day I had it until I finally just put a hood tach on the car and put a factory clock into the dash.

this goes into the category of: better than nothing if you really want it and have nothing else but another flaming beacon of "repop sucks" in my book. other opinions may vary!

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Old 11-08-2021, 01:24 PM
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now tell us how you really feel ;-)

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Old 11-08-2021, 04:51 PM
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The one I'm looking at has a metal housing, backlit like the original, and mounts like the original ... I'm guessing it's a different product. Picture of it looks pretty good.

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Old 11-08-2021, 04:58 PM
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My previous comments were based on a tach that had a metal cup..

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Old 11-09-2021, 01:44 AM
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Quote:
Originally Posted by padgett View Post
AFAIK the two different tachs were for transistor/electronic vs points ignition and date back to 1963 (Delcotronic). For a points ignition a simple passive circuit was enough but for an electronic ignition a transistor front end was added to the same circuit.
I knew you would know this Mr. Peterson. The professor of the Pontiac hood tach!!

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Old 11-09-2021, 08:12 AM
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Quote:
Originally Posted by dataway View Post
The one I'm looking at has a metal housing, backlit like the original, and mounts like the original ... I'm guessing it's a different product. Picture of it looks pretty good.
ah, someone must have stepped up to offer a better repop. mine came from somewhere between 07-09 vintage. good to know!

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Old 11-09-2021, 12:50 PM
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if you dont mind NOT being able to read it at night ,,,, buy one

the illumination is super whimpy

I just went thru this with a clock in a 68

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Old 11-09-2021, 03:35 PM
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Did have to mod the light circuit to convert a factory hood tach to run with an HEI. Think I used a Vega circuit board (little round white ceramic one with plated on resistors. Changed the one cap to switch from 4 to 8 cyl then wired the hot lead for the transistor to the lights and changed grey dash light lead to hot in run. Calibrated with a pencil and eraser. Worked pretty good.

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Old 11-09-2021, 04:26 PM
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You can't upgrade the OEM bulb to a brighter LED?

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Old 11-09-2021, 04:32 PM
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Probably, just a bayonet base. Last time I modded one was before LEDs.

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Old 11-09-2021, 04:59 PM
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Quote:
Originally Posted by dataway View Post
You can't upgrade the OEM bulb to a brighter LED?
I had my hood tach serviced by another party this summer. Excellent work and the bulb were upgraded to LED and are bright/white and easily read, using the original sockets.

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