I have a 451 passion. I would like to install a tach also, couldn't I use the wires that are going for the factory tach? I like the ecometer but also have the glowshift elite three pod w/oil pressure and water temp plus volts. I have the scan gage but like to use it on other vehicles so don't want to mount it and it is harder to read. I am new to this forum and appreciate all the info out there. Thanks for your input.