the sending unit is the ground ... as you've said the guage zero's out when power is applyed I'd say the sending wire isn't making contact or is broken ... quick check disconect wire from sending unit an put jumper wire to it & a good ground ... should send guage up if not wire is probley broken check with ohm meter
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yep
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don't you just hate it when that happens ...oh well your not to first person to have GROUND problem ... (that is why my reply started with the SENDER is GROUND) 
most of the problems I've seen while answering questions on this board are ground related at least you figured it out before buying new guages !!!
most of the problems I've seen while answering questions on this board are ground related at least you figured it out before buying new guages !!!
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I don't know about a new guage being avaible ... but I have used Redline gauge & clock repair in Tennessee 1-731 661-0239 call them
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first tho did you clean all the junk out of the threads where the sender screws in?? I mean like with a small wire wheel down to bare casting ?? & did you check & clean the power supply line to the guage ?? Intermit problems are the hardest to track down... taking the dash out & apart isn't much fun
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