1984 GMC truck K1500 305 I'm about to buy a tach and oil pressure guage for my truck. After doing research, I think I understand the installation process. Please tell me if I'm heading in the right direction. The pressure guage I'm going to buy is electrical, so it should come with an electrical sender that threads into the intake manifold by the dist., right? For the tach, where to I get the rpm signal. Is there some place on the ignition coil that gives a rpm signal? Thanks for the help.