LMC Fuel tank sending unit

[53lowdown]

I have a 20 gal LMC fuel tank that mounts behind the rear axle. I think the sending unit is bad. Guage always reads empty, but disconnect the wire at the sending unit and gauge goes to full.

Question is, is there some other readily available sending unit that fits these tanks? I've heard it is a 'blazer' style tank. Just wondering if I can get a replacement sender at local parts store instead of ordering another one from LMC.