guys: on the back of the buick tachometer (72 gs) that i obtained from my brother, yesterday, there are two prongs which connect into the plug from the dash wiring harness. my gs is not wired for the tach option. since i have to do a little creative wiring, can someone tell me if the lower prong is for the coil to tach connection & the other prong to the right & above is for power ? i think the lower prong is for the tach (brown wire in tach optioned car). tkx. gerry
