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If get one you will very happy. Back in the day, put one on my '70 Barracuda low perf 383 and a 3310-1, really cheap headers. It was great. I had no problem with 351W Mach 1's. But a good 340 Duster would take me most of the time. Good luck with a DP4B.
Since I used the tach drive tach for many years, the threaded cap is long gone. Now I just use a black plastic cap plug over the threads, zip tie to secure it.
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Only two wires, eh? That's odd. I only remember 4 wired ones.
Lead from coil, ground, power from switched source, light from dimmer.
Actually there are three, one fell on the floor before I took the picture. There are four pins in the center on the board, but it looks like...