My old daily driver 88 Suburban has a TBI 350 engine in it. I want to install an Autometer tach to keep track of the revs when towing. It doesn't have a regualr HEI dist in it. It has a small cap dist with seperate coil and brain box and I don't know where to hook up the feed to the tach at! If you know for sure please let me know. Thanks!