I have an XJ650L and the guy I bought it from said they just put a new turbo on it.
When I ride it, the needle barely moves...should it move?

If the needle doesn't move, you may not be revving it hard enough (you need to be at about 5000rpm under load before boost begins to build), your sending unit might be toast, your gauge might be toast, or the turbo might not be working. The wastegate may also be seized open. You can check for this by seeing if there is any exhaust coming out of the right side muffler. If there is, it is open. Exhaust should only come out of the right pipe when the wastegate opens (chopping the throttle shut after heavy boosting). It's also possible that you were lied to, or he installed the turbo and didn't fill the oil gallery before starting the engine, which can cause bearings to seize. Believe me, you will know when the boost hits. One thing you can do, is remove the line going from the surge tank to the wastegate actuator and hook it up to a 15psi pressure gauge. This will tell you exactly how much boost you are getting. Mine does 13psi, and I have heard the surge tank popoff valve exhausting once, which is set for 15psi. The boost needle will bury itself deep into the red on my bike. It's an 82, which means it was initially setup for only 7psi boost. I disconnected the wastegate hose, since the wastegate was seized shut anyway (yours probably is too).

ok,...how can i check the right exuast...can i do it while revving the bike at a standstill? or do i have to be on it? is it never supposed to come out the right side at all unless the wastegate is open? when is it supposed to open? hehe...am i confusing you as much as i am myself? ;)

Yes, you can rev it and see if ANY exhaust is coming out of the right muffler. None should be coming out. This pipe simply takes the exhaust that gets dumped by the wastegate and sends it backwards. The wastegate only works when max boost pressure is exceeded. This pressure is taken from the black aluminum surge tank connected to the carbs, and is brought down through a tube and airflow restrictor ( a round plastic device about the size of a prescription bottle lid) on to a diaphragm actuator which opens the wastegate. If you look inside the bodywork behind the right footpeg, you will see this line and air restrictor. If your bike is an 82 and was not retrofitted with the "power-up" kit, the air line is taken directly off of the compressor housing and runs through a short airline to the actuator.

hey, thanks.. :D i appreciate you helping me..do you have a pic of your bike?

It's in the Anything Goes thread. Just click on the link there.