I need to switch over to the electric speedo setup from my mechanical. I am doing a 4th gen dash swap and need an electric 4k ppm vss so I can run the 4th gen cluster.

How would I go about doing this? What do I need to switch it over? Am I going to run into any problems? I have been searching but Im still kind of clueless as to how to do this to my car.

My car is an '87 350 Iroc w/auto tranny and obviously the mechanical speedo. Thanks.

 

Any ideas???? ive read the tech article on this site where the guy says the swapped a mechancical to electric speedo from an 86 Firebird SE into an 83 Camaro SC; both had the V6/5-speed. The Camaro (being destined for Canada) had no ECM, and neither vehicle had cruise control Now since I do obviously have an 87 Iroc, with ecm, cruise control and an auto tranny, would the wiring pretty much still be the same for my application? Will this tech article work for what Im doing?

Please help because I suck at wiring and don't understand this whole mechanical vs. eletric vss thing.

 

anyone????????

 

I'm sorry to disappoint you but I cannot help you.
Just wanted to say that I changed from th700 (electronic speedo) to manual tranny and I have no idea how to hook it up
I've heard that you can change the part of a trans to which you mount vss, but I did not try to do that.
so.....
Anyone?

 

go to the junk yard and find a car/truck with the 700r4 in it(you will need a late 80's early 90's) and a electric speedo, grab the vss and plug, then pull off the extention housing(tailshaft housing) and remove the vss tone wheel(toothed ring on the tailshaft), all of this will fit in your trans, then, if the ppm is wrong, you will need a convertor, something like the ones from http://www.dakotadigital.com/ that will work , look in astro vans from 88-92 for the vss stuff, others from the same years may also have the same parts, but you wil need to look for sure

 

pecha


there are convertors that will take a mechanical speedo from the trans and convert it to a elecrical signal, search and you should find something

this is one from autometer


5291
Hall Effect Speedometer Sender
7/8" - 18THD, Hall Effect sender, 16 pulse per rev. Includes pass-thru drive for cruise control

 

Thanks Dave Y. So what your saying is pretty much what this article is saying right? http://www.angelfire.com/mt/psh/speedo.htm



This is still a little confusing to me. Not sure how the whole vss system works so Im not even sure if I am even asking the right questions. But
What determines the ppm? Its the Vss right? So if I get a vss that sends the speedo 4k ppm's (which my new 4th gen speedo will need) that takes care of the signal to the speedo. But my computer will need a 2k ppm signal so that is where the buffer (yellow box from the Firebirds) comes into play right? Doesn't it convert the signal from the speedo back down to 2k to send to the computer?

 

a factory vss from 88-92 should be 2k ppm, not sure, you need to research some more, if it is, you will need to send it to the computer before the convertor and to the speedo after,

 

thanx Dave Y, I'm gonna search for it!

 

im not sure how old this post is, i found it in the search functin but I may have a buyer for my 4thg en dash and he needs to know how to gets his speedo working with a cable driven setup. I couldnt give him an answer so maybe someone here has already done this. what does he need to do His car is an 88 iroc. whats the cheapest route to getting the speedo to work

 

Taken from another post:

If your car is a 91-92 then the speedo is not cable driven, it uses VSS. The VSS signal comes straight from the tranny. When you swap in the 4th gen dash and cluster, the speedo on the 4th gen cluster wont read correctly. It will jump all around. The 4th gens also use VSS but at different pulse rates. The solution is a Dakota Digital box that goes between the tranny and the cluster (on the VSS line) and makes the VSS signal 4th gen cluster friendly. So that way you can use a 4th gen guage cluster (or more specifically, a 4th gen speedo) with the stock 3rd gen tranny. Other than that, the rest of the wires from the guage cluster should be a straight up splice deal.

Find the dakota digital box at http://www.dakotadigital.com

 

Dude, your post means nothing to my questions. Where did I ask what I need for MY car? I asked what a friend needed to CONVERT from mech to electrical on HIS car

 

eveything you need is in this thread already, just read it again

 

It does answer your question...

 

I think the 4th gen vss and speedo is a totally different breed than the article your reading above. I think your only solution is to get the module from dakota digital. I think dave Y had the right solution as you will need that tone gear and such.

 

These are the 4 types of VSS

The two-pulse (2000 pulses per mile) square wave (D.C. current or direct current) used on all TBI engines through 1992, all computer-controlled-carbureted engines, and on 1985–1989 TPI engines.

A four-pulse (4000 pulses per mile) sine-wave (A.C. current or alternating current) signal is required by the 1990–1993 TPI, 1992–1993 LT1 engines, and 1990–1993 Camaro 3.1/3.4 V6 engines.

A 40 pulse per driveshaft revolution speed sensor used on 1993 and newer trucks with automatic transmission, 1994 and newer rear drive cars (Camaro, Corvette, and Caprice) with the automatic transmission.

A 17 tooth per driveshaft revolution speed sensor used on 1993–1997 LT1 engines with the Borg-Warner 6-speed transmission. An 11 tooth reluctor ring is used on 1993 LT1 engines with the Borg-Warner wide ratio (3.35 First gear) 6-speed transmission.

 

Ok, I hate to bring back the dead, but I'm in a similar spot. I have a T5, dunno what year, with mechanical speedo, and a 700R4 from an '88 that I wanna swap. I want to put the T5 in, with the mechanical, but I wanna kepp my 120mph Speedo form the 88 in there....how can I do this? Does anyone know what I mean?

_Ray_

 

Just get an electric VSS for the T5. You will need to make sure that the gear on the VSS is the correct one. Your 120 spdo is electric. The VSS for an auto and a T5 are different.

 

Ok, that's what I was guessing... should I jsut ask local junkyards for an electric VSS from a T5?