I just got a 5" tach and with it I got a electic water and oil temp gauges. My question is, the water and oil temp guages were free and are just the guages(no wiring). I want to install them in a few days, can I just splice them to the stock guages? If so, how? I am just looking for a simple install, the guy that sold them two me said I can just run a wire to the stock harness. Anyone have a good link to a detailed tach install? Let me know what my options are. Thanks.