Melted fuel pump relay, also the oil switch can i blame the oil switch?

91 Buick Regal 3.8, first, blow up fuse, uprated it, bad, then, oil light on with key off, couple of days, melted pump relay module, almost car fire!, replaced pump relay module, still key off - oil light on, two minutes - oil switch melted, replace oil switch, not connected because melted plug, runs fine,... show more 91 Buick Regal 3.8, first, blow up fuse, uprated it, bad, then, oil light on with key off, couple of days, melted pump relay module, almost car fire!, replaced pump relay module,

still key off - oil light on, two minutes - oil switch melted, replace oil switch, not connected because melted plug, runs fine,

but even while the oil switch is no connected, no oil light on the dash.

testing on the wiring on the oil switch i found current is it normal?

Faulty oil switch made the mess?, can i plug it again...
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