Gauges

[Burning Pyro]

ok so my buddy was like hey lets put some different gauges in place of your stock ones. ok no problem i s guess. we got em, i started to intall them, had to use a dremel and grind out some plastic here and there, doesnt look horrilbe. now none of my gauges work. except the speedo and fuel, i replaced the boost, oil to pressure gauges and the water is a newer electronic one. the boost and the oil arent going to work because im waiting for a new boost controler to come in and the oil needs the sandwich plate still. the water im sure is my fault i didnt exactly wire it up professionally. but my real question is why isnt my RPM gauge working now?