Electrical Issues after an engine swap

I had an engine swap. My ignition switch was funny to get the key in and out, so my mechanic switched my ignition after the engine swap. Now, my digital dash is semi frozen; the mph stay on 0, the mileage is stuck on the mileage at the time of the engine install, the fuel gauge is up and down rapidly and very inaccurate. Most recently, my wipers started going extremely slow and then stopped working and now my running lights do not work when my lights are on. I checked the fuses under the dash and all are fine. Never had any issues before the engine swap and I was told it might be the computer. Please help