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07-20-2018, 08:34 AM
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#1 |
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Registered User
Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
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Aftermarket Electric Speedometer
For those of you that have added a speedometer controlled by your ECM
What brand of speedo are you using ? What is the signal that is produced by the ECM? Does the transmission VSS make a difference if it is a 4L60E or a 4L80E or is the "magic" controlled by the ECM and not the VSS? What Pin or Pins control the speedometer and what is the signal that is transmitted to the speedometer?
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53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
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07-20-2018, 12:59 PM
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#2 | |
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Senior Member
 Join Date: Jul 2009
Location: Athens, AL
Posts: 499
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Re: Aftermarket Electric Speedometer
Quote:
The PCM outputs a square wave with an amplitude of 12V and a frequency that varies with vehicle speed on pin 50 of the red or green connector (depending on whether you have a "red/blue" or "/blue/green" PCM). The VSS output defaults to 4000 pulses per mile (4K ppm), but can be changed in the tune. 4l60 and 4l80 both have 40 tooth reluctors on the trans output shaft and the VSS sensor reading the teeth on that reluctor wheel outputs an AC sine wave that increases in both frequency and amplitude with speed. Most speedometers are going to want the square wave from the PCM and not the sine wave directly from the VSS. |
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07-20-2018, 06:26 PM
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#3 |
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Registered User
Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
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Re: Aftermarket Electric Speedometer
I have a combination of a 2003 4l60E and a late model LS3
Thanks with that info I think I can answer his questions I don't have the ECM in front of me but is a new ECM and the engine runs and the trans shifts, working on the dash speedo and Tach next I can get an electric conversion for the tach but I can only use the stock speedo "Face" which has a 180* sweep
__________________
53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
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08-06-2018, 12:43 PM
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#4 |
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Registered User
Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
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Re: Aftermarket Electric Speedometer
Will there be a description on the aftermarket speedo to indicate what signal it needs to make it read MPH
__________________
53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
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08-06-2018, 06:40 PM
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#5 |
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1965 Chevy C10, 2005 4.8L/4l60
 
Join Date: Aug 2004
Location: DFW Texas
Posts: 8,546
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Re: Aftermarket Electric Speedometer
I used a Dolphin electronic, 8k was the setting I believe.
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