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Are you running the Opto or going direct to the processer? But a pullup is needed since the dizzy is just a switch. I get +5V from within the VR conditioning area to install a 450 Ohm pullup.


I don't understand what you're saying there.

I'm using the VB921 high current ignition driver in MS, triggering the coil (-). The distributor is from a '90/'91 Montero (assuming it's good - haven't tested it in a vehicle) and I'm taking the signal from the low resolution wheel (6 signals/revolution) and not using the high resolution signal at all.

When I was checking the distributor (off the truck and not connected to MS) to see which wire was which with my digital voltmeter, I applied B+ to the sensor. I found the signal output voltage low - about .2v - does that indicate that I need to install the pullup resistor circuit? If so, what value resistor would you use?

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum