Bartamos,
The cluster is a donor, it is original equipment. It only has the oil line input, see attached pic above.

That was my problem I guess, I was searching for a mechanical sending unit for a '74 motor and not finding anything. So I should have no problem plugging in a '66 mechanical sending unit into my block? That's what I guess I need to know.

Thanks


"The greatest use of life is to spend it on something that will outlast it" ~ William James

'25 Chevy Superior
'66 Chevy C10
'03 Chevy Silverado 1500 HD