Vibration could be normal, does it do it mostly when turning? The U joints cause vibration when the wheel is hard over. Even if it does it straight, it still may be normal. Get someone with experience with this drive and engine to go for a ride and see how it feels to them.
The trim sender is under a round plastic cap on the starboard side of the drive where it pivots up and down. It could be bad or it may just be unplugged in the engine compartment. Look for a black duplex wire (like a lamp cord) coming from the starboard side of the drive inside the engine compartment, and trace the wire until you come to the connector. If it's all plugged in, you'll need to check for continuity from the guage back to the trim sender. I think you'll find that if it's troublesome ot troublshoot, you can live without a working trim guage.
The speedometer pickup is in the front of the drive leg. With luck, it's just got some debris in it. It operates solely by pressure. The faster you go, the more pressure is applied to the speedometer (which is really just a pressure guage. If the inlet is not clogged, the hose that goes from the drive to the speedometer may be broken.
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