This oil guage I recently purchased has a up graded or changed connection for harness. The oil guage I purchased a few years back has a 5 wire connection, this one only has 4. Wanted to use the existing harness but 5 wire doesn't fit into guage set up for 4. Plus I also have 2 other glow shift guages connected to this one as well. ? The glow shift guage is a 4 rating because of the changed connections.