Try contacting Medallion
800 828-8127, you can try asking for Tom at x358, not sure if he's still there. Here is what I have on early model gauges (pretty sure the odometer is also by Kysor and may have a current service part avaialble thru Medallion, www.medallionis.com):
at least after intro of ISC/ISL engines, gauges read digital info relayed thru the “Message Center” & “Vehicle Data Condenser” or VDC both mfg'd by Kysor, later Kysor-Medallion and now Medallion. First digital gauges were Kysor-Medallion, later gauges at least by 04 models are BorgWarner, MPH #7754-00010-01 and TACH #7754-01010-01. BorgWarner is apparently out of the gage business (all per email from 01Alpiner 7/8/12).2004 4in1 gauge has the following information on it: Borg Warner Air/Fluid Systems, 6913-00200-11, 4IN1, V/CT/Fuel, OP