You are going to have problems swapping a '73 into a '78. 73-75's uses an AMP gauge, all others use Volts. That means rewiring to get it to work. Also the '73 will have a mechanical Oil sending, were the '78 will have electrical.
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Chris Lucas
1973 Chevy C-10
1978 GMC Jimmy (2WD) - SOLD
1987 R10 twin turbo LS
1991 R3500 SRW CrewCab
1985 K5 diesel swapped project
1989 K5 2WD conversion w/ Vette susp Project
Captkaos Customs
73-87chevytrucks.com
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