There is a good chance you replaced your senders out of position by at least one spline tooth. I've been there myself. Do as
tpenfield suggests so you can trim full down w/o the skeg hitting the concrete floor. Or do it in soft dirt, but get it fully down. Remove the clamps and screws and start rotating the sender until the gage needle moves close to full down. I'd guess to start rotating CCW, but that's a guess. When you get the gage needle close to full down, pull the sender and rotate it to where the screw holes are visible and engage the closest spline. Then fine tune the hsg. till you get a full down gage. By now you'll be in adjustment range, and know if you have to reengage a new spline, and which direction.
Trim limit is basically the same, but you'll want a helper to run the helm trim control. Starting drive down, have your helper trim up until the drive stops. If it doesn't move, rotate the unclamped hsg. CCW until it starts to lift, and then continue rotating until the distance between the trim cyl. pins is 20 1/4". If the drive goes above this when starting the adjustment, lower the drive down, and repeat by turning the hsg. CW until you find the cut-out point, and repeat the above. Again, you may be off by one spline tooth, but you'll know which direction to reposition.
