Hi I am restoring a 1966 Ford F250 352 engine with 390 heads & edelbrock intake manifold with 4 barrel carberator . my problems are wiring in the dash. the oil pressure gauge works but the oil pressure light is not coming on. & the light is supposed to be on when the key turns on & when pressure builds up goes out . but the light is not doing this. Thank You in advance for any help. Jim.