no start- elecrtical short some where in dash ?

69 cuda, did MAD electrical rewire 2 years ago, no electrical problems, other then not all the gauges worked correctly, fast forward this past winter took out gauges and replaced with VOD,did not get time to check out system to make sure all work, this past week finally had some time, hooked up battery no smoke or any sign of problem ,dome lite worked, got in car to try to start it , but no power, then noticed that the dome lite was out, I know the battery is fully charged have had a battery tender on it, started checking for power with test lite, found no power on either side of the fire wall connector nor the new wire used in the MAD rewire, I have the power coming thu a 16 gauge fuseable link, feed by a 20amp fuse , I have a power tap under the hood that is feed right from the starter relay , found this 20 amp fuse was blown, replaced fuse with 20amp, was able to crank the car 1 time then it blew again as I said did not have any problems till new gauges install. as part of the new gauges the speedometer does not use the cable but is wired with a hall effect sender now in the trans, is it possible that since these gauges use the full 12 volts and the hall effect sender pulling to many amps ?? of is there a short now somewhere in the dash ??