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You can actually set the external flash not to fire in the menu settings of your camera. Check there or try mounting the flash on your camera, turn both on and reset your camera to factory default settings through your camera menu settings.
Yes you can but it won't TTL and you will need to fire it from or with a slave/light cell. This will make your system more like a studio set up. You will need to increase/decrease the light intensity using different modifiers for special effects. My portable/location set up uses 2 Vivitar 283's, a Canon 533G, Nikon SB 15 and a Canon 420 EX all fired from little flash slaves. here is an e-Bay reference link
The trigger voltage of the 45CL-1 is about 12V, so it should be safe to connect directly to the hot shoe with an adaptor, or to the pc soclet, if the D90 has one. If the D90 is anything like my Canon 40D, which can stand about 30V on the hot shoe, then all the 45CL series will be ok, as they have trigger voltages between 9V and 12V. The 45CT-5 has a trigger voltage of 15V and works well on the 40D. I use 3 different Metz 45 models with my 40D and all work well on automatic, where the flash sensor itself controls the light output.
You can use the Sunpak on a bracket with a "slave trigger" and fire the slave with the Nikon's pop-up flash. I do the same with a SunPak 3600 Auto Zoom. Just remember not to have the red-eye feature operating. Those little slave triggers are only a couple of dollars and I already had few brackets.
Originally the 45CT1 had high trigger voltage. In the production period Metz improved it to a much lower voltage release circuit. Metz homepage (metz.de) holds the information, from which serial number on have 45-CT1s low trigger voltage. However, even the high trigger voltage was lower than 200 volts, thus safe for your Fuji. Laszlo
Personally, I would not try it. While the Canon has a protection system built into the camera, the trigger voltage on the Vivitar is pretty high. I have had good results using a 283 on a slave shoe, you will have to stop down more with the extra light