I have an intermittent missing problem in the #1 cyc. I pulled up the fuel rail to verify that the #1 inj. is not working. I am gettting 12 volts on the red/wt wire but nothing on the tan/wt wire. Wires have continuenty from inj to dem, so I suspect the Dme. I have 0-261-200-405 do have to have a -405 or will somthing else work?

Thanks,
Bud