Hi all, the tacho is no working fine, I was sorprised when dismounting instrument cluster the blue metal plate in tacho has marked 4CYL/DSL but in from of instrument clster is written UNLEAD FUEL ONLY so I dont understand ...so the tacho was going full scale when starting motor , so I ordered the equivalente chip LM1819N and replaced. now when ingnition is on the reading is very low , almost hidden at bottom , when starting engine the reading is 3000, tapping smooth the throtle goes full scale. it looks like if it has very much gain. I tried to find schematics diagrams but was imposible.
anyone has experience ?
I want to simulate the ignition coil and fix the problem outside of car because I understand that the signal is coming from it .