OBD0 16-Bit RPM Formula
RPM to 16-bit hex value conversion formula for OBD0 Honda ECUs.
Adapted from pgmfi.org wiki
To translate engine speed (RPM) to the 16-bit hexadecimal values expected by OBD0 Honda ECUs:
ECU Hex Value = 1920000 / RPM
Excel Conversion
If you are compiling custom ROM tables in Microsoft Excel or Google Sheets, you can calculate the hex string using:
=DEC2HEX(1920000 / RPM_value)
Credits and source
Authors Anonymous PGMFI contributor
Source Adapted from OBD016 Bit RPM on pgmfi.org wiki. Licensed under CC BY-NC-SA 1.0.