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I'm kinda confused by your comments. If the rod fell off your wastegate actuator you wouldn't have a loss of power; rather, your boost would continue rising at full throttle until you eventually threw a rod or otherwise detonated the vehicle.
The wastegate tops out the boost and keeps it as safe levels. It is basically just a safety valve or really basic way of controlling max boost. I would surmise the reason you are running such high boost levels is because you have no wastegate to cut it off and it just goes up and up. Very similar to the problem people encounter when the hose for teh WG actuator rots off on the front bottom of the turbo... it juist keeps going up.
What you want to make sure is that your emergency kill switch is safely attached to the system. In the event you redline the turbo and approach dangerous levels, it cuts off fuel to the engine. Not sure about you 88, but the one on my 85 745t is located directly above and slightly to the right of the gas pedal. You can find it by following the vacuum hoses in teh dash... a hose come from the bay and hits a T connector. One hose from teh T goes to teh dash gauge, and the other hose goes to the emergency cut-off switch.
good luck,
rt
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