I disconnected the battery cable while removing my gas tank and sending unit. Then, after reinstalling the tank and sending unit, I reconnected the battery cable. Now, the only guages that work are the mechanical ones, speedo and oil pressure. The temp, amp, and gas guages have stopped working. What do these guages have in common that could have stopped working all at the same time? Does anyone have any ideas about where should I start looking to correct this?

Oldbolter
1959 Apache 3800 dually flat bed/dump with 261
1956 3800 dually flat bed/dump with 235
1957 3600 flat bed, 350 engine, 700R4, PS, disc brakes, 14 bolt rear with 4.11 gears