I have factory gages on my '83 C20 and want to hook them up properly to the new Goodwrench engine that I'm working on. The water temp wasn't working right and I found that the wire going to the block sensor was disconnected. The oil pressure wasn't working either because it always registered 40psi even when the engine wasn't running! The questions I have are as follows: What do I need to get these fixed? Arent they electric and at the most need new sending units? or, are they kinda junky as they get old? Will sending units on the engine do it or do I need to look at the gages themselves in the dash? Thanks.