Tach Signal on Mitsubishi
The stock RPM meter has one wire towards ECU. I tried to tap it to one of injector channels, and added it to all h[0] masks. The gauge was working properly but there are two difficulites:
- Right now I use all injector channels, so I don't have free inj channels anymore
- No tach signal at deacceleration (decel fuel cut), so gauge shows 0 rpm at decel
If you have free ignition FETs, use an ignition channel in the same way you used injector channel and added to h[0], only with ignition FETs. If there are no FETs left, wire ignition FETs together, with diodes seperating channels. One of the electrical engineers can help you better with this method, eg type and size of diode, etc.