Why does this happen?

Wondering if anyone is/plans on running R35 GTR Coil on Plug setup, Thoughts? These are super popular coils with the R32,R33,R34 GTR guys but I haven't heard anything about them on DSM's...Also it says Evo 1-3 & VR4 but they should still work with 1Gs and 2Gs correct...

https://www.dsmtuners.com/threads/1g-2g-dsm-manual-transmission-and-transfer-case-rebuild-factory-mechanics-training-service-manual.517370/This will help out

Thanks again for the help guys.Next time i have the tach out ill take pictures of both units and post them to here, maybe someone much smarter than me can figure out how to make the 90's work.No worries the more info about the tach on this thread the better

no everything is reading fine now. the pointer wasn't put on completely and was in the wrong place

yes running 91-94 coil pack and PTU. Car is a 90 shell with Rywire engine harness... this harness uses the 91-94 configuration for everything else.. the chassis harness is a 90 however and im still trying to figure out all the dash wiring and accessories.also when I had it set up to see...

**UPDATE**The what i believe to be a 90 Tach does not workThe what i believe to be a 91 tach does but reads about 300RPM low.

okay ill give it a try. i have a spare cluster from what i believe to be a 91 so ill also try that gauge to see if it works.

Sorry i shouldve explained better. can i use the ECU pin 109 and Directly wire that to the back of the factory tach to make it work (using that as the signal). i see rpm in link so can i rob that signal to use it for my factory tach without any issues. or is it better to steal it off the PTU?

I'm doing some wiring clean up and was wondering if i can just run a wire from my factory tach to the ecu pin 109 to get the signal without any issues? its a 1GA 90 with a rywire harnessEdit im seeing RPM in link

have you tried recalibrating the TPS in link? log TPSvolt and see if it has any movement when moving the throttle

90GSXBlue submitted a new DSM Profile :Old BlueRead more about this vehicle here...

Thanks that's the great place to start.