<div class='quotetop'>QUOTE(RedHeartbeat @ Apr 24 2006, 01:18 AM) [snapback]50968[/snapback]</div>I dumped my 93 PCM. Not needed so far. You need to feed the speedo sensor feedback from the transmission into the speedo box behind the glove box, it's a little white box about 2 inches square. Use the stock relay if you can. I re-used the stock relay on both my conversions. That saved me buying a $3 relay.
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You can take the speedo signal from the PCM, tie two leads in the buffer together, and get the speedo to work through the PCM, that's what I did. Now I can cal the speedo for axle ratio, tire size etc.. I can get the pins you need to cross if you want it. Essentially, the speedo buffer (little white box) is built into the controller now, and totally calibratable (sp? is that a real word) in the PCM.
Going from memory here, my 1993 had two white/clear connectors the connected the underhood harness with the body harness. I think the green/white wire was for the speedo signal. I tied that into my the PCM adapter harness I built, pulled two leads from the speedo buffer, and tied them together. BAM speedo worked perfect.
HTH
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