Right now it only has tubes stacked on top of each other that are for nickles.
Do I need a whole new unit to have the dime tubes?
Yeah basically, yours is the early model that only gives change in nickels (same as a Coinco 9800 series) if you need dimes in your change, then I'd go with a later model Coinco 9400 series(nickel/dime change), or a three-tube Coinco 9300 series or equivalent MARS coinmech. just make sure it has the 8*-pin "Jones" plug & is rated for 115 volt service,
*= PS the round pin in the Jones plug doesn't count although some people would call it a 9-pin plug (they are wrong) it's just an index pin so you cant plug the thing into the machine backwards.