dash swap tach probs
#1
Member
Thread Starter
iTrader: (9)
Join Date: Feb 2009
Location: Nowthen, MN
Posts: 323
Likes: 0
Received 2 Likes
on
2 Posts
Car: 87 monte aerocoupe
Engine: 383 HSR w/ novi 2000
Transmission: Built 4l80e circle d converter
Axle/Gears: Currie 9" 3.89 gears
dash swap tach probs
I am just finishing up my 4th gen dash swap. Looks great, its from a 95 LT1.Problem I have is all the gauges work and are accurate except for the tach. It reads correct to 2500, then it has a seizure, most of the time it falls down to around 1000 or it spikes high to 5000. As soon as the motor gets below 2500 again, its accurate. I know its a v8 cluster and am not sure a dakota box will fix it. If anyone has some insight, it would be appreciated. Would it help to wire it direct from the gauge to the dizzy instead of using the old wire from the old cluster pigtail?
#3
Member
Thread Starter
iTrader: (9)
Join Date: Feb 2009
Location: Nowthen, MN
Posts: 323
Likes: 0
Received 2 Likes
on
2 Posts
Car: 87 monte aerocoupe
Engine: 383 HSR w/ novi 2000
Transmission: Built 4l80e circle d converter
Axle/Gears: Currie 9" 3.89 gears
Re: dash swap tach probs
It really was not that bad, some cutting, but a lot of wiring. That is what took the most time. The console wasn't that bad, but I have a megashifter, and that took a little fabbing to work. If you do a search for 4th gen dash swap, there are quite a few good threads for wiring, where to modify, and some pics.
#4
Re: dash swap tach probs
Try wiring it off the ignition coil or dizzy. I had a similar problem but it was vice versa - I had a 4thgen motor and a thirdgen dash with a bouncing tach.
#5
Member
Thread Starter
iTrader: (9)
Join Date: Feb 2009
Location: Nowthen, MN
Posts: 323
Likes: 0
Received 2 Likes
on
2 Posts
Car: 87 monte aerocoupe
Engine: 383 HSR w/ novi 2000
Transmission: Built 4l80e circle d converter
Axle/Gears: Currie 9" 3.89 gears
Re: dash swap tach probs
I gave that a try last night without luck. I think now I am going to add a ground strap to the motor, make a seprate ground for the black/white wire off the cluster and go to the block with that one also and see what that does.
#7
Member
Thread Starter
iTrader: (9)
Join Date: Feb 2009
Location: Nowthen, MN
Posts: 323
Likes: 0
Received 2 Likes
on
2 Posts
Car: 87 monte aerocoupe
Engine: 383 HSR w/ novi 2000
Transmission: Built 4l80e circle d converter
Axle/Gears: Currie 9" 3.89 gears
Re: dash swap tach probs
Yeah, that one too, and the red wire I think to a ground also, its that wierd one that in the wiring guide off another thread that needed to get grounded also. I know the cluster would not work without it.
Trending Topics
#8
Re: dash swap tach probs
Here's some pinouts I found for both 95 LT1 Camaro and 95 LT1 Firebird Clusters:
Camaro-
http://shbox.com/1/95_z_cluster_pinout.jpg
Firebird -
http://shbox.com/1/95_ta_cluster_pinout.jpg
Camaro-
http://shbox.com/1/95_z_cluster_pinout.jpg
Firebird -
http://shbox.com/1/95_ta_cluster_pinout.jpg
#9
Member
Thread Starter
iTrader: (9)
Join Date: Feb 2009
Location: Nowthen, MN
Posts: 323
Likes: 0
Received 2 Likes
on
2 Posts
Car: 87 monte aerocoupe
Engine: 383 HSR w/ novi 2000
Transmission: Built 4l80e circle d converter
Axle/Gears: Currie 9" 3.89 gears
Re: dash swap tach probs
That is in part the diagram I used to wire the cluster, heres a link to the other.https://www.thirdgen.org/forums/atta...od-wiring.gifA couple of the wires did not quite jive, so I used both to get it to work.
#10
Member
Thread Starter
iTrader: (9)
Join Date: Feb 2009
Location: Nowthen, MN
Posts: 323
Likes: 0
Received 2 Likes
on
2 Posts
Car: 87 monte aerocoupe
Engine: 383 HSR w/ novi 2000
Transmission: Built 4l80e circle d converter
Axle/Gears: Currie 9" 3.89 gears
Re: dash swap tach probs
I tried adding grounds, moved the orange wire to a battery lead, direct wiring, the only good result I got was that I separated the black and the black/white ground and made a new ground for each of them. Now the tach does not fall off until about 2800 rpm. I am really scratching my head at this that I cant figure it out.
#11
Member
Thread Starter
iTrader: (9)
Join Date: Feb 2009
Location: Nowthen, MN
Posts: 323
Likes: 0
Received 2 Likes
on
2 Posts
Car: 87 monte aerocoupe
Engine: 383 HSR w/ novi 2000
Transmission: Built 4l80e circle d converter
Axle/Gears: Currie 9" 3.89 gears
Re: dash swap tach probs
Update. I got the tach to work properly. Here's what I did for those out there that have the same problem. I added a msd 6al-2 box which I was going to do at some point anyways. One problem I found with my dizzy was that the condenser inside somehow got disconnected. I am not sure that fixing that would have solved the tach prob, but that is one thing to check for. After the new box was wired up, the tach also works properly. Coinsidentally, it runs better now with the new box.
#12
Member
Join Date: Oct 2006
Location: Phenix City, AL
Posts: 140
Likes: 0
Received 0 Likes
on
0 Posts
Car: 91Z, 97RS, 99Z, 02Z
Engine: TPI 383 Vortec, 3800, LS1, LS1
Transmission: T56, 700R4, T56, 4L60E
Axle/Gears: 3.73, 3.43, 3.42, ?.??
Re: dash swap tach probs
Hey man I got your PM and thanks for the info/direction. I had thought about adding an MSD box to mine, but coming back over here to Iraq kind of put everything on hold. To include the 99 Z28/M6 I picked up for just $1200 right before I left. Thanks again
Thread
Thread Starter
Forum
Replies
Last Post
84z96L31vortec
Tech / General Engine
7
08-20-2017 12:16 AM