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Crazy Idea |
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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5118 |
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Posted: Nov/21/2021 at 7:44pm |
I've been playing with some junk tachometers I have for my '69 AMX. Wondered about transplanting a new tach drive in the original location. Found a 10,000 RPM tach that appears to have a nearly identical scale as the 8,000 RPM stock tach. 0 and 7,000 RPM are inline with the needle pivot so I've purchased an Auto Meter 233909 with the intention of using the stock faceplate with an aftermarket instrument. Will update this thread on the progress. -Steve- |
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Mopar_guy
Supporter of TheAMCForum Joined: Jun/07/2009 Location: Ohio Status: Offline Points: 4805 |
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Not at all crazy. In fact it's done quite a bit. My tach has been converted with a new tach in behind the original face and needle. You can't tell the difference but it works with the Hemi when no adaptor would make the original work.
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"Hemilina" My 1973, 5.7 Hemi swapped Javelin |
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hassyfoto
AMC Addicted Joined: Nov/16/2009 Location: Maryland Status: Offline Points: 3378 |
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I did the same as Mopar_Guy. I have a modern tach behind a old faceplate. ANd I just had to freshen up the faceplate during the process.
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Murphy's Law:
Any given mechanical job you decide to solve alone will imminently require a third hand, at its most critical moment |
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sweatlock
AMC Addicted Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3285 |
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Yep, I did the same. At least the tach is now accurate, lol.
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Amx68
AMC Apprentice Joined: Jan/08/2010 Location: Ontario, Canada Status: Offline Points: 145 |
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How do you guys determine what aftermarket tach will work best behind the factory faceplate? I would be interested in this for my 68 Amx and keeping that factory look.
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1968 Amx - Was 390/4spd, will have mild 360/5spd T5 (project)
1999 Jeep Cherokee Limited - 4.0L Auto, 3-link front, 6.5" lift, 36" Swampers, locked front/rear, 4.56 gears, doorless, etc. Wheeled & DD |
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sweatlock
AMC Addicted Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3285 |
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Physical size, sweep and quality (brand/price). I used an Autometer 2698 Z-series, analogue, 2-1/16” diameter, 0-8,000 RPM tachometer, available at Summit Racing for $159.99 Below is a photo of the front and back - disregard the male terminals for the wiring on the back, they’ve since been replaced with a 3-wire (trailer hitch type) connector. Also disregard the position of the needle in the front photo - that was prior to calibration/adjustment: Edited by sweatlock - Nov/29/2021 at 11:13am |
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george w
Supporter of TheAMCForum Joined: Jan/27/2013 Location: New Jersey Status: Offline Points: 2899 |
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How were you guys bable to transfer the original tach needle to the replacement tach to maintain the factory appearance ? What brand tach was used to make the switch ?
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Long time AMC fan. Ambassador 343, AMX 390, Hornet 360, Spirit 304 and Javelin 390. All but javelin bought new.
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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5118 |
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I was wondering the same thing. -Steve-
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sweatlock
AMC Addicted Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3285 |
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For me, I removed the factory needle and super-glued it to the Autometer tach needle.
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troutwilly
AMC Addicted Joined: Sep/14/2007 Location: Carriere, MS Status: Offline Points: 991 |
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Make sure you calibrate it and check it with an external tach. A different weight needle could throw it off. Their internal springs and mechanisms are calibrated for their specific setups/weights.
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Bill O.
70 AMX |
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