Split my Vss signal now speedo issues

[ffr3247r]

I'm using this Vss on my trans and split the Vss signal that feeds Speedhut speedo and went to the JS10 to provide my MS3x with a speed signal. My speedo is now @20 mph off even after a recal. What is wrong?

http://www.speedhut.com/ecommerce/produ ... etic-pulse

[Six_Shooter]

Because you can't simply split a signal like that most of the time.

You need to use a buffer to to be able to split the signal.

Typically people use DRACs/VSSBs from GM vehicles of the early '90's, or the Dakota Digital SGI-5, which serves a very similar function.

[slow_hemi6]

VSS can probably only drive inputs with very high impedance. Did you use the input circuit with 1K resistor and diodes? Maybe try with 10K to raise the input impedance.