jeejee

iTrader: (3)

I'm looking for a speedo that would work with a T56 and would be round and a separate unit. ?
(not incorporated with a rpm and water temp etc etc..)

pref. something NOT aftermarket ?

thanks.

Jeejee

G-Body

iTrader: (4)

Are you using the PCM for an LSx too or is the T56 going to be behind a carbureted motor?

What brand of speedo do you prefer?

There are tons of electric speedometers that will work, almost all of the large gauge companies make a programmable electric speedometer.

jeejee

iTrader: (3)

it going to be behind a carbd engine (well to be exact a PROPANE fueled engine but the result is the same = no ecu)

i would prefer something that came on a car from the factory.

would the aftermarket speedo's allso require the ecu / dash to be installed for some reason ?
or would they work directly from the signal from the T56 ?

Jeejee

jeejee

iTrader: (3)

bump ?

stealth71

iTrader: (15)

You just need a gauge that can accept the VSS output. I can't remember if it's square or sine wave signal. I think it's square wave signal comming from the VSS, but someone can confirm that.

Search, I have read about it before.

G-Body

iTrader: (4)

The VSS puts out a 40 pulse per revolution Sine Wave AC signal. Most of the newer speedometers will accept this output. If you have one in mind and post up a model # I will see if I can find out for sure.

stealth71

iTrader: (15)

The Autometer speedo I have will accept both inputs.

I don't know of any OEM gauges that would work.

G-Body

iTrader: (4)

You could use an OEM GM gauge, but you would need a convertor to convert the signal. The GM speedo will be looking for a 4000 pulse per mile square wave DC signal. You would need to use a (DRAC) digital ratio adapter controller from an 87-89 full size truck. They are programmable to adjust for tire size/gear ratio, but I don`t know what you use to program them.

You may also be able to find an electronic adapter from dakota digital.

I don`t know what GM car would have a speedometer that would work, I know the late 80`s trucks had speedometers with the odometer in them, but they were only half round. I looked around for a round GM speedo with the odometer inside it when I was doing my conversion, but I never found one.

jeejee

iTrader: (3)

thanks, i allso haven't found any round meter yet

maybe i should go for an autometer if these DO work with the electronic signal from the T56

digitalsolo

iTrader: (24)

Autometer or VDO will work, I've used both, connected right to a GM VSS output.

cam

iTrader: (9)

BLARG! I'm having an issue with my speedo. I was previously running the pulse directly off the VSS right from the trans to the speedo and it worked fine. I had one wire to the input on the speedo and one to the ground. After posting about whether or not the PCM needs VSS on a t56 and discovering that it does I wired the VSS to the PCM as stock and used the pin 50 Red ( speedo output ) to the same input on the speedo and now it doesn't work. Is this a square wave/sine wave issue? Whats the fix? I'm sure I could figure this out but I have the entire car bolted back together and wanted to bounce this out to you guys before I tear it apart so I can pinpoint where to attack and avoid unnecessary work. Thanks

mmmchickenboy

Dakota Digital Speedometer Signal Interface

jannes_z-28

I am not sure but I believe that all GM cars from '98 and later have a common standard interface when it comes to instrumentation.



Jan

cam

iTrader: (9)

Should have specified its an autometer ultra light pro comp electric. I guesds what I need to know is do I hook it back up direct and splice in the PCM feed or is there another/better way?


***edit*** I spliced it into the VSS feed from the trans and unhooked the speedo output from the PCM and its working again. No idea if its pulling trouble codes as my service engine light was already on. I will update after the tune if this is a problem. If no update? No problem

Right? riiiiight