CB Custom - Speedo/Tach Wiring Issues

[pekingduck]

You understand I hope, that the serial data line is a bi-directional data line. Digital information. We, on the board, do not know the data format. The info transferred is in the service manual.

I have done some research on the speed sensor. Using a scope I got nothing unless i put the probe on one wire and the probe ground on the other wire. Grounding to the chassis didn't work. Needed a signal ground, I guess.

LP, when I was testing CB1100 speed sensors for my cast/wire wheel swap, I was also unable to get any voltage signal off any kind. That was despite using 4 different analog and digital meters, and a test harness that let me test every possible way.
I was able to pick up a signal on a milliamp scale though. I scratched my head and gave up at that point.

My understanding is that the serial data line is for fuel mileage calculations for the display only, but it looks like it also is for the FI light. Does that sound right?

Thank you all. Yeah, its a brand new gauge from Daytona. They themselves dont even have a lot of info for me, too soon for google also. Im just winging it at this point. I know its risky but it will be worth it in the end. Thanks to the plandemic I have nothing but time.

I currently still have the original gauges connected and stored under the seat so hopefully it will run as designed but with the digital aesthetics if i could just tap in. The install manual showed that if the rpm and speed pulse were connected to the ecm , it would give me the gear indication. But i just cant figure out the ecm wires. The ones i followed from the rear speed sensor (pink/white) (green/red) are not giving me anythingm ive tried many variations to get a reading but nothing.

Ive read before about the serial data bus but again I cant figure out which wire, to test it out. The tacho is labled clearly but again nothing happens when I tap in. I grounded the new gauge, connected positive to batt. Dont know if that matters or not but cant think of what else could keep it from reading. I got the power, nuetral, gas, turn signals so far, not concerned with the temps or warnings because of the stock gauges.

I guess I will have to used the after market speed sensor, and rpm reader on the coil but that leaves me with no gear indicator, unless of course I install a seperate one. Kinda defeats the all in one digital but thats worse case.

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Looks like you're making good progress. I have found that the wire around the spark plug cable has been most reliable, but don't know if it can be calibrated to compensate for a "waste" spark, or will it just read 2 X the rpm.

When you use the magnetic pickup, I recommend using it on the rear wheel so the wiring and sensor are less visible. You could mount it on the sprocket.

As far as the gear position indicator, it looks like it is a calculation that the new meter learns from comparing road speed to engine RPMs. Once you have the tach and speedo functioning, just follow the instructions. You can send me or others on this thread a PM with your shop manual excerpts.