Sharing input signals

[CTX-SLPR]

Howdy,

Well I'm wiring up my L67 ECM (again) and while I have no idea what it's doing with the gas gauge input, I am currently splitting the tank sender output between an analog gauge and the ECM input. Should I be concerned about messing up with the ECM sees by having the analog inline?

There is a "Fuel Flow Out" off of the ECM that headed back to the stock Grand Prix instrument cluster but no idea if it was just a repeated signal or if it had be "interpreted" to run the gauge and warning light on the cluster.

Comments?

[Matt Cramer]

Does the sending unit have a separate power wire (I haven't seen that too often) or is it a one or two wire hook up? If it's two wire, I'd worry about the bias resistors in the gauge and ECM interfering with each other.

[Beagle]

I wouldn't trust anything using an ohm output for a reading to be split - I don't know why other than if I put 8 ohm speakers in series I get 16 ohms load, or 4 if I put them in parallel. That said, if it was voltage output, I'd be more likely to try it.

[CTX-SLPR]

Good points, no idea what the ECM does with it anyway so I'll run the gauge with it and see what happens. If it causes problems I guess I'll have to wire in the "fuel flow out" and see if I can run a gauge off of it.