Best bet is to add an electric sensor/gauge..the orig is Mechanical and cost big $$$.
Any Auto Parts store.

Sometimes you can snag a used one on ebay, but you never know if it works 'til you get it ....I see guys cut the capillary tube when they remove them, thinking it is an electrical wire ...no kidding !!!

Wonder if they think those are electrons hissing out when they cut it......duh.
" I taught dat wuz da ground wire , Man..."

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A Dalton