Docked Wage

I'm getting started on a 63 Chevy C10 swap and want to use the original mechanical speedo in the dash.

In the past I've used a Shift Works tailshaft conversion kit for the 4L80E but it does not look like they have one for the 6L80E.

I'm thinking I need to get a speed signal off the CAN bus and then drive the speedo via a Cable-X.

Can someone please confirm? Also which CAN adapter should I get?

Thanks, Ken

BP Automotive

iTrader: (3)

A cable x would be your best bet. It will convert the signal from the ECM and spin a cable to drive your speedometer. They run about the same price as a aftermarket speedometer.

You can also have your mechanical speedo converted too.


All of the options run in the neighborhood of $300

ls1nova71

iTrader: (4)

Since there's no speedometer out put from the PCM, how do you hook up a Cable X, or any other aftermarket speedo othet than a GPS or a CANBUS type gauge??? This is the reason I've stayed away from the GEN4 stuff. If theres a way to get the signal from the CANBUS, I'd like to hear about it.

BP Automotive

iTrader: (3)

There is a speedometer output on the Gen IV just like the Gen III. The Cable x reads that and uses that to drive the cable.

ls1nova71

iTrader: (4)

What pin is the speedo output on a 2009 6.0? There's nothing I can find.....

Docked Wage

BP,

I'm curious also. I thought the speedo and tach were handled by the BCM via messages from the CAN on the E38. If there's a pin for speed out I'd love to know about it.

Ken

71403

E38 ECM, X1-57 is the 128k VSS output to ABS. Cable-X works fine on it.

Docked Wage

Pulling my hair out because I'm having problems with the Cable X and could really use some fresh perspectives as I'm not getting a speedo reading when driving.

Here's what I know or have checked:

The ECM is getting a VSS signal from the 6L90E. It shifts fine and I can see speed on the CAN bus with my handheld scanner.

I double checked with my tuner that 128K Speed output was left ON in the tune.

It's set up with power, ground, and the Speed signal wire from the ECM X1-57 (Yel/Bk).

The unit powers up when the key is on and the status LED blinks.

I can run the field test procedure and it spins the speedo up to 20 MPH when sitting in the driveway.

I set the Dip Switches to 127,950 Pulses per Mile (as close to 128K as I could find)

I verified there are no voltage drops at the connection of the Cable X.

I verified the yellow/black wire between the Cable X signal input White wire and the X1-57 pin is good with a meter.

The status LED just blinks when driving.


Thanks in advance for any help,

1989GTA

If you are using HP Tuners you need the latest program. The earlier one will not activate the VSS output even if the software switch is on. If you are running the latest program you might need a occillisscope to see if the signal is present and not a hardware issue.

Docked Wage

Excellent! Thanks for the response!

Can I assume it's a 5V square wave signal on the wire?

Regards,

Patro46

The best solution I could find was to use the tailshaft to do the job that's been done forever. I didn't like the thought of a rather pricey motor driving a tough to turn anyway cable and speedometer. I'd bet they make a solution.

http://www.digitalcorvettes.com/foru...d.php?t=215641