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e7 limp mode


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This is my first post here but have been lurking for a while.  I've got a 95 RD690 with a E7 400 electronic pump.  Bought the truck a few months ago and had some issues when we bought it.  Have fixed everything except the power issue.  We think the engine is in limp mode.  The truck starts and idles fine.  But it has no power whatsoever.  We've checked for boost leaks.  Installed a pyrometer and boost gauge. 15 psi boost on a hard pull and pyrometer doesn't get any hotter than 5-600 degrees.  The speed sensor is not hooked up and we can't find the speedometer wires going back under the truck (no twisted wires).  My question is can I just not run 2 wires from the speed sensor and tie into the ecm or the harness somewhere?  And if so what wires to splice into.  Any help is greatly appreciated.

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