Hic":3phn5m6d said:You need RPM signal. Put it on the -IG wire on the module. The AC needs only that to work. Nothing else.
ST185pinjo":1qyv6k02 said:Are you using a SM4 on the celica(ST185), or smc?
Hic":2d3imryx said:AC and ECU are separated in celica. If you use ignition module, use the pin for tacho OP and conect it to the wire which gives you the revs in the gauge. (tachometer) AC will then work. Ac needs only RPM signal, nothing from ECU!