Thank You, New did not know this was discussed before. I guess I am feeling a liitle lucky (so far) I started this morning, I bought the 7 gauge set, 5 center and speedo/tach. They also sent 2 senders 1-oil temp and 1-water. 2 smoked lenses. I use the factory fuel, oil presure, volts is volts. Got the 5 gauge cluster in my origianl 5 gauge bezel with no problems (they eliminated the clock) and the speedo/tach in the housing good. Have all gauges working but speedo. I have a 79 cable driven (this was my real question) but the wiring diagram indicates that there is a speedo sensor, sensor and cable both? or do I need the optional cable speed to elec pulse piece @ $59.00. More simply put, does a 79 have a useable sensor/sender to avoid the extra part, even though it is obviosly cable driven???? I paid 399.00 for the seven gauges, 5 center and 2 speedo/tach, THUSFAR I am actully very happy, the whole thing went easier then I expected, and they look great, but as of now, no speedo operation the other 6 are good.