I have search many times and have not found a proper answer to my problem. I have a 88 crx HF and have installed a JDM EF9 cluster that has the electronic vss connection. The cluster works with no problems, I have installed a VSS onto my D-series transmission and the guage picks up the signal just fine. My problem is that the ECU with Hondata s300 does not pick up the vss signal like the cluster does. I figured it was a bad ecu at first but than I tried the ecu on a friends car and it picked up his signal with no problem. I checked voltage at the vss pin (b10 on obd1 ecu) and its a constant 13-14v. I read that the vss signal is suppose to pulse from 0-12v and thats how the ecu knows how fast your going. I have my vss power (Blk/Ylk) connected to the "while running" 12v source on the under dash fuse box, the signal (Orange) going to ecu and cluster (cluster reads speed just fine), and the black grounded to the transmission. Is there something that I am wiring wrong that the signal is not pulsing? Any suggestion will be greatly appreciated, I am trying to get this sorted out so that I can use boost by gear and launch control on Hondata s300 which are speed based/activated.