some of the indy shops, with actual mechanics have the diagnostic tools to check and diagnose the early bikes.... that said the bike has the M&M efi system,, they are very limited in the ability to tune them.... my opinion would be, with this system,, if it start, runs, idles amd performs OK, with mileage above 40mpg under normal circumstances,, leave it alone do the services on time and ride it...
even adjusting the idle,,, properly, with a scanner,, is a PITA.. leave it as it is,, thr only things that normally go wrong,, are the IAC, CHT, TPS, stepper motor or worn throttle shaft...
if it has over 25k miles change the fuel filter,,, carefully.
the sensor parameters can be read with a VOM,, but it is not as accurate as a scanner... on these ald models,, i would verify the scanner readings with the VOM rradings wcomparing the readings to the specs in the service manual.