67-72 Electric speedo

[diegos72]

10-4 will keep on rubbing.

[cebra]

Where are folks buying their 5/8” wired bulb sockets? I bought the ones referenced here (T3.25 from Super Bright LEDs) and they were 1/2”. I have since bought 3 other sets over the course of a month and 1 set of 5 fit but the guy doesn’t have anymore. I still need 4 and have searched to the wnd of the internet I feel. Thanks for any info.

[lutronjim]

I bought these. They pop in but are pretty tight on the holes that have tabs for tubes - like turn signals.

http://www.classicpartsusa.com/produ...xoCzQgQAvD_BwE

[cebra]

The guy I bought my set that fit from has more available now. They are 2 wire which I preferred. The only "modification" needed is that they are loose as the space between the tabs and the round part of the housing is too far apart. I bought a pack of rubber water hose seals for $2 at Tractor Supply that fit perfectly to keep the tabs snug against the underside of the housing. Good guy to work with and he notified me as soon as he got more in:

https://www.ebay.com/itm/5-T10-Twist...784e:rk:1:pf:0

[68lsc10]

Pm sent about purchasing the printed gauge face stuff to do the mod.

[68lsc10]

Payment sent to ls1nova71

[69c10phil]

How do I get the kit

[ls1nova71]

Originally Posted by 69c10phil

How do I get the kit

PM sent

[jjzepplin]

I want one too!

[ls1nova71]

Originally Posted by jjzepplin

I want one too!

PM sent

[jjzepplin]

So my donor car 99 Trans Am has a round pattern needle driven speedo but has a tach. Would this one work?

[cebra]

I am having a similar issue, I have 00' 4.8L with 20" wheels/50 tires, 3.08 gears, and NV3500 manual trans. My speedo is about 2x what it should be (reads 90 at 45). Does this need to be adjusted with a tune due to the tall trans/gear/wheel size?

[ls1nova71]

Originally Posted by cebra

I am having a similar issue, I have 00' 4.8L with 20" wheels/50 tires, 3.08 gears, and NV3500 manual trans. My speedo is about 2x what it should be (reads 90 at 45). Does this need to be adjusted with a tune due to the tall trans/gear/wheel size?

I'm thinking its due to a difference in speed sensors. It should be fixable in the tune though, you would have to talk to your tuner to be sure.

[cebra]

I am having it tuned Thursday so hopefully that resolves the issue. If I have the wires on the VSS backward (the pigtail I bought just had 2 black wires), would this cause the speedo to read high or would it not read at all? The pigtail on the original harness had the purple vss wire on the right so I put the right black wire to the VSS lead to my speedo so I assume it is correct but thought I would ask, thanks.

[ls1nova71]

If those two wires are switched it wont make any difference.

[jjzepplin]

Any updates for this?

[ewoody625]

It's been quite some time since I've posted on this page, but I've still found a lot of useful info including the write up on this Speedo conversion, so thanks for that. I'm hoping I can get some help wiring this thing. I've tried to follow the picture but it's a bit difficult with all the wires bundled together. Thanks again for the write up and any help is much appreciated. The bottom picture is what I have so far.

[ls1nova71]

It looks as though you have most of it figured out. You just need to tie the dash lights together and add ignition power, ground and a signal wire for the gas gauge. Is there something specifically you need to know?

[ewoody625]

Originally Posted by ls1nova71

It looks as though you have most of it figured out. You just need to tie the dash lights together and add ignition power, ground and a signal wire for the gas gauge. Is there something specifically you need to know?

Do I tie in the turn signal lights with the rest of the dash lights? It looks like you grounded something above the fuel gauge? I was thinking it might be easier if I wire my plug into the truck harness first and then follow it over the the gauges? The ignition power needs to run to each gauge?

[ls1nova71]

Originally Posted by ewoody625

Do I tie in the turn signal lights with the rest of the dash lights? It looks like you grounded something above the fuel gauge? I was thinking it might be easier if I wire my plug into the truck harness first and then follow it over the the gauges? The ignition power needs to run to each gauge?

You don't tie the turn signals with the dash lights because if you did, they would light up whenever the dash lights are on. They need to be hooked up to the wires that power the turn signals, they are dark and light blue. The ground above the gas gauge is just where I decided to ground the whole cluster, you need to be sure it has a good ground.

You can wire the truck side first if that makes it easier for you, it doesn't matter which you do first.

Yes, all the gauges that are electric will need their own ignition power.

[ewoody625]

Originally Posted by ls1nova71

You don't tie the turn signals with the dash lights because if you did, they would light up whenever the dash lights are on. They need to be hooked up to the wires that power the turn signals, they are dark and light blue. The ground above the gas gauge is just where I decided to ground the whole cluster, you need to be sure it has a good ground.

You can wire the truck side first if that makes it easier for you, it doesn't matter which you do first.

Yes, all the gauges that are electric will need their own ignition power.

Duh... that makes sense. Thanks for the help

[ewoody625]

So I think I have this figured out, but I'm unsure of where the red and green wire go?

[ls1nova71]

Originally Posted by ewoody625

So I think I have this figured out, but I'm unsure of where the red and green wire go?

You mean pink and green? There are pins that stick up on the back of the circuit board, and by them they are labeled what they go to. The pink goes to Ignition power and the green goes to Speedometer out put. If I remember correctly they are labeled IGN and SPD.

[ewoody625]

Originally Posted by ls1nova71

You mean pink and green? There are pins that stick up on the back of the circuit board, and by them they are labeled what they go to. The pink goes to Ignition power and the green goes to Speedometer out put. If I remember correctly they are labeled IGN and SPD.

Yes pink and green. I have them on the circuit board but I don't know what to hook them up to in the truck. I did want to ask, there was a wire labeled ammeter to ignition. Can I use that as my ignition power? Would i get speedometer output from the ecm? Or is that what vss is? Sorry for all the questions but i think i got in over my head on this one.

[ls1nova71]

I'm not sure what that wire labeled ammeter is, but I probably wouldn't use that for ignition power. The gauges will have power already going to them, so you would just need to use that wire. The speedometer wire would come from the PCM.