'79 L82 tachometer mystery indicator
Thread Starter
Instructor
Joined: Jun 2005
Posts: 142
Likes: 15
From: Austin TX
'79 L82 tachometer mystery indicator
I recently removed the tach / speedo cluster so I could replace my long-since-broken wiper switch. I'm hell-bent bound and determine to make the damned car weather tight so I can actually drive in the rain.
I digress.
The L82 tach faceplate has a rectangular hole. There's a socket for an indicator lamp, and the traces going to that lamp on my car (originally a THM350 for the transmission) go to NOTHING in the instrument cluster connector. There are only 8 total wires and the bottom four are not connected to a wire, and two of those four go to the socket behind the mystery hole.
There's no lens and I don't recall there ever BEING a lens. I've found nothing in any manual, diagram, parts list, etc. which hints at what the lens looks like, and no one seems to have whatever the hell it is for sale.
Help?
I digress.
The L82 tach faceplate has a rectangular hole. There's a socket for an indicator lamp, and the traces going to that lamp on my car (originally a THM350 for the transmission) go to NOTHING in the instrument cluster connector. There are only 8 total wires and the bottom four are not connected to a wire, and two of those four go to the socket behind the mystery hole.
There's no lens and I don't recall there ever BEING a lens. I've found nothing in any manual, diagram, parts list, etc. which hints at what the lens looks like, and no one seems to have whatever the hell it is for sale.
Help?
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
I believe what you are describing is where GM put a lens saying 'CHOKE'.....I do not have my 1979 wiring diagram here at home...but I DO KNOW that this CHOKE light was used in the 1980 and 1981's.
So if I read what you wrote correctly....there are two OPEN cavities in the wiring harness connector that plugs into the back of your speedo/tach cluster....that go to this mystery light socket ...that have nothing in them...CORRECT... IF YES....do not worry about it.
I hope this helped.
DUB
So if I read what you wrote correctly....there are two OPEN cavities in the wiring harness connector that plugs into the back of your speedo/tach cluster....that go to this mystery light socket ...that have nothing in them...CORRECT... IF YES....do not worry about it.
I hope this helped.
DUB
Thread Starter
Instructor
Joined: Jun 2005
Posts: 142
Likes: 15
From: Austin TX
The Quadrajet that was installed when the engine was replaced (ZZ4) has an electric choke. I wonder if I could get it to tell me the choke is on ...
I also found the lens. I'd ignored it because it's a "double width" lens, but I found the lens with "CHOKE" on it on one half of the width and nothing on the other half.
