What size aftermarket tach fits in the dash of a 1968 Olds Cutlass Supreme?
#1
What size aftermarket tach fits in the dash of a 1968 Olds Cutlass Supreme?
What size aftermarket tach fits in the dash of a 1968 Olds Cutlass Supreme? From researching I think it would be the 3 3/8", but I am not sure. Any help would be appreciated. Thank you!
#3
This was mine. It was a Mercruiser tach but I sold it so I can't tell you for sure what size it was. I think it was 3 1/2". A stock gauge is about 4 1/4" so anything smaller than that will fit
![](http://imageshack.us/m/51/4415/hpim0082i.jpg)
#5
I found another pic I have of it. It came out nice. If I didn't find a nice factory tach/gauge set I never would have gotten rid of it
![](http://img442.imageshack.us/img442/5180/hpim0083a.jpg)
Last edited by allyolds68; April 8th, 2013 at 05:52 PM.
#7
I have read on these forums that those repro pieces are kinda junky and made of plastic. I've even seen one that wasn't completely sealed. That's why I want a nicer unit, such as the American Muscle unit from Autometer.
#8
I bought one of those pieces of junk. It doesn't work with an MSD ignition. I bought mine when I first started my restoration. By the time I was able to start the engine, it was out of warranty. I called the dealer and they put me in touch with the guy that makes it. When I told him my setup, he criticized me for using an MSD box. Says it works with points or an HEI. I have an HEI triggered by a 6AL. He gives me move grief about the MSD. He finally told me that the movement inside was from some 80’s GM car. No help other than that.
I called the MSD tech line and they said that the 80’s something tach movement should work when plugged directly into the 6AL’s tach output. It didn’t. They suggested that I try a MSD 8920 Tach Adapter. Well another $60 and that made it work, well sort of. By the time I finished the restoration and put the pedal to the floor, I discovered when my MSD rev limiter hit 6400 rpm, the tach was reading 5000. Not another penny on this piece of ….
Before the restoration I had a cheap Auto Gage tach that worked perfectly with my setup. I just wanted something that looked original.
Buyer beware…
I called the MSD tech line and they said that the 80’s something tach movement should work when plugged directly into the 6AL’s tach output. It didn’t. They suggested that I try a MSD 8920 Tach Adapter. Well another $60 and that made it work, well sort of. By the time I finished the restoration and put the pedal to the floor, I discovered when my MSD rev limiter hit 6400 rpm, the tach was reading 5000. Not another penny on this piece of ….
Before the restoration I had a cheap Auto Gage tach that worked perfectly with my setup. I just wanted something that looked original.
Buyer beware…
Last edited by SWinner; May 16th, 2013 at 08:54 AM.
#10
#13
more information
Hello Mr Gary! I know this thread is old but I'm at the gauge stage and as far as i know yours is the only post that says "no modification bolt right up" that's what i need I'm definitely a newbie. My real question is how does your Dolphin gauges look at night? Do you have any pictures of them illuminated? Thanks
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