Mini Speedo acting like Tach
#1
Mini Speedo acting like Tach
I installed a mini speedo to a 2005 Sportster custom. I wired in like the attached diagram. Two wires to the main harness (harness from old speedo, 1 to the accessory wire and 1 to ground). The other three I spliced into coming from the speed sensor. When I turn it on the speedo goes to 100 mph then back to 0 and displays all zeros. When I start up the bike the speedo acts just like a tach. So i tried taking the orange (signal) wire from the VSS to the databus wire from the old main harness. When I did that the speedo now jumps all over the place. I don't know what else to try.
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#7
The 2004 and later Sporty does not use a "typical" analog signal from a speed sensor (VSS) to drive the speedo, it uses a digital signal from the serial data buss that comes from the ICM/ECM. Regular analog speedos won't work won't work on 2004 and later bikes.
If the speedo doesn't say it's compatible with the Harley serial data buss (2004 and up Harley), it's not going to work.
If the speedo doesn't say it's compatible with the Harley serial data buss (2004 and up Harley), it's not going to work.
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#8
Yup, that's the same speedo my friend used. He had four different shops tell him it wouldn't work but one guy told him it would so he bought it. Fortunately that guy promised him he would take the speedo back if it didn't work.
Long story short, he went back to the stock speedo with a fork mount.
Long story short, he went back to the stock speedo with a fork mount.
#9
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06-13-2012 07:53 PM