So, I can read (some) codes with the Innova 3030, but not all, and I cannot do stuff like fix the revs/mile for the speedo and odo.

So I was wondering what other tools offer a step or three up in this area, and what do they cost?

IIRC, there is a Solus Pro, and there are at least one other computer that Sir Sam has, whose name escapes me. ANy other worthwhile options?

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2005 Liberty CRD- ARP studs, Fumoto, Hayden FC, inline Tstat, ETechno 7v GP, Platinum P1, in-tank lift pump.
1983 Volvo D24T
1981 Volvo D24
Dodge Cummins TD
Case 580B
Mitsubishi MT180 diesel
Kubota BX25 diesel

Pretty much only one that will work for you for what you want,That is the DRBIII(which sirsam has) which is Chryslers OEM scan tool up to '05 mpdel years.Not a cheap unit either by any means.