Thank you for reading,
I have an '87 non-turbo auto that I swapped a late model 1JZ into. Its running on a Haltech platinum sport 1000 on a custom harness which has caused issues of its own, but I believe these are now sorted out. My questions are regarding some of the ancillary components of the build and hopefully someone could help me shed some light on one or more of these issues.
- I have read that the 7M-GE tach requires a pulsed signal with 40V (negative?) peaks in order for it to function. My problem is I no longer have a place to connect to for this signal as I am now running COPs. Can I combine the output from the ignitor's three channels (with diodes to prevent interference) to make a usable signal to feed to the tachometer?
- My speedometer is cable driven however my R154 has only an electronic speed output. In my research it seems most r154s have a place to connect a manual speedometer cable however mine does not (perhaps because it is out of a jzx110 rather than an older car?). I have tried to adapt the speedometer wheel and sending unit to work with the r154 however it doesn't seem feasible (mounting is different, gear itself is smaller and different tooth pattern, angle in relation to the drive shaft is different). It seems the easiest way to fix this would to modify a modern electronic speedometer to fit into my cluster and utilize the electronic sending unit, can anyone give me any tips on this or other ideas?
- The coolant temp sending unit as far as I can tell is the same from 7M to the 1J. But since I am not using the stock ecu (or for that matter any stock wiring outside of headlights and turn signals) do I need to do anything special or just wire the sending unit directly to the combination meter?
- I have the 7M oil pressure sensor installed, and as with the coolant temp is there anything I need to put between the sending unit and the dash?
Thank you very much for any advice you my be able to offer,