s13 gauge cluster problems

[vin diesel]

in my s13 i have a 180sx cluster, the tach always worked and the speedo never did. so i got another speedo from the junk yard and swapped it in. and now neither of them work. :confused: any ideas. idk if it matters but its a s13 with a redtop sr

[vin diesel]

i found out that if i bump the plug going into the cluster for the tach. my tach works. which wire would cut the signal in and out