As far as i know the guage sender is in the same place on all tanks. This is at the back on the underside. It will have an electrical connection to it. You should be able to measure it easily.
The only difference the haynes manual notes is that for Bosch injection the sender is screwed on. I'm think that would be the 5 inch one as the non screwed in one isn't that big from when i took it out last time.