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Boss 302s gauge issues

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TMSBOSS

Spending my pension on car parts and track fees.
7,551
5,283
Exp. Type
HPDE
Exp. Level
10-20 Years
Illinois
with Bill at Heartland Topeka. Small issue. Bill has a new oil pressure sender installed. Oil pressure still erratic. Ranged from normal pressures to minus 3 psi. Yep, first time I heard of oil vacuum. Who knew.
Question. Does the VDO sender require a ground?
 

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