Suzuki Sidekck tank in 69 GMC?

[rscam]

I know it sounds stupid but here me out. I have already run my exhaust and in my opinion a Blazer tank hangs to low under the truck from some of the pics I've seen. I went to a junkyard and looked under numerous cars and trucks for and alternative. I found a Suzuki Sidekick tank that will go under the rear of the bed and bolt in with no cutting(other than the fuel filler hole) at all. It also would bolt to the frame without straps. The bad thing for most would be its only 11 gallons. That dosen't bother me because I only drive it occassionally. Its about 2.5 inches thinner than a Blazer tank so you wouldn't see it as easily under the bumper. My only ? is would the signal from the sending unit be compatible with my gauge?