First off I'd like to thank any and everyone who might be able to help me on this matter.My name's Mark. I'm new here, I've posted in the newbie check in and Look forward to helping when I can. I have 18 years of dealership experience, and I'll do what I can to help. I have a 89 w-150 power ram. I put an 85 police interceptor out of an old diplomat, put a little bigger cam in it, and dropped it in with a set of headers. I used the stock throttle body fuel injection. I could never get this thing to run right. It would surge at idle, die and get really crappy gas mileage. It run great at a 3000 rpm cruise. But, when I came to an idle it would die with a map/vacuum code. It would'nt run right again until I keyed the ignition off and cleared the fuel trims and restarted it. 1 thing I know was wrong is the o2 sensor was too far away from the engine. I had to put the bung in the collector. Another is the flow of the 360 heads on the 318 hampered with the computer. Well I got tired of it, and yanked it all off and rewired the ignition, and the voltage regulator and put a carberated intake on it. The only issue I'm having is with the ammeter. It's a shunt ammeter (It dont carry all the load like the older ones did) It has 2 wires, a red one going into the cluster from a splice at the battery and a black one coming out of the cluster. Where would you recommend putting the black wire?? I have gotten rid of all the problematic fuse links and installed a maxi-fuse power distribution center. I'm just not sure where I should put the black wire. I don't have it running yet but I've put the wire on the ignition circuit and it shows a discharge. But thats because it's wanting to power up the ignition module and coil through the guage. if i put the wire on the fuse block main terminal the guage just sits idle and wont move even when applying loads. Should I put the black wire on the alternator battery terminal? Not sure. I'd like to have a game plan before I put the carberator on it and put it all back together. Thanks again in advance to any who might be able to help.