Odd lights lighting up after splicing


May 8, 2011
So I have had the car almost 2 years now and it has had an inop aftermarket RPM gauge and my boost, temp, pressure had no backlighting. Finally tackled that issue last night and got the tach working and spliced all the gauge lights into the headlight switch. Last night worked great, this morning still no problems, then this afternoon I turn the car on and there is no fuel reading, no radio, both turn signal indicators on steady, brights indicator on, factory dash tach and boost gauge inop... What happened and how do I fix this??