67-72 Electric speedo - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68GMCCustom · 02-02-2013, 12:11 AM

I just wish I knew how/where to pick up on the VSS signal... so I can get my new electric speedo working...

**Captainfab** · 02-02-2013, 12:36 AM

There should be an output from the PCM. Do you have the pinouts for your particular PCM? That should tell you which pin to connect to if there isn't already a wire there.

Quote:

Originally Posted by 68GMCCustom

I just wish I knew how/where to pick up on the VSS signal... so I can get my new electric speedo working...

ls1nova71 · 02-02-2013, 12:48 PM

Quote:

Originally Posted by 68GMCCustom

I just wish I knew how/where to pick up on the VSS signal... so I can get my new electric speedo working...

Looking at your sig, you're running GenIV engines. There isn't an output for speedometers in those PCM's. that said, there 'may' be a solution but I have not personally looked into it much. Dakota Digital is making a CAN BUS 'module' of sorts that allows you to use their aftermarket gauges, it plugs into the ALDL connector. Whether or not it would allow you to use it with other brands of gauges I can't say. Also if you just want gauges Speedhut also makes a line of CAN BUS gauges that will work.

**Captainfab** · 02-03-2013, 01:01 AM

I did not realize that. How is the speedo driven in the OEM applications then?

Quote:

Originally Posted by ls1nova71

Looking at your sig, you're running GenIV engines. There isn't an output for speedometers in those PCM's. that said, there 'may' be a solution but I have not personally looked into it much. Dakota Digital is making a CAN BUS 'module' of sorts that allows you to use their aftermarket gauges, it plugs into the ALDL connector. Whether or not it would allow you to use it with other brands of gauges I can't say. Also if you just want gauges Speedhut also makes a line of CAN BUS gauges that will work.

68GMCCustom · 02-23-2013, 01:35 AM

Quote:

Originally Posted by ls1nova71

Looking at your sig, you're running GenIV engines. There isn't an output for speedometers in those PCM's. that said, there 'may' be a solution but I have not personally looked into it much. Dakota Digital is making a CAN BUS 'module' of sorts that allows you to use their aftermarket gauges, it plugs into the ALDL connector. Whether or not it would allow you to use it with other brands of gauges I can't say. Also if you just want gauges Speedhut also makes a line of CAN BUS gauges that will work.

Well....I installed an Autometer GPS unit for my electric speedometer, and a Painless GM/genIV tachometer driver that feeds off the crank sensor. My diagnostic port stays free this way....and will remain hooked to the Aeroforce scan gauge.

testing tomorrow!

lts70 · 02-24-2013, 10:42 PM

Money sent for two speedo kits

02-02-2013, 12:11 AM	#1
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: 67-72 Electric speedo I just wish I knew how/where to pick up on the VSS signal... so I can get my new electric speedo working... __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

02-24-2013, 10:42 PM	#6
lts70 1970 Daily Driver Join Date: Jun 2007 Location: Glenns Ferry IDAHO Posts: 1,035	Re: 67-72 Electric speedo Money sent for two speedo kits __________________ It's not truly yours if you didn't build it yourself or if you don't do your own maintenance.



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