MicroSquirt CAN Transmission Controller with 4L80E Subharness

A 4 pin HEI module tach output is off the negative terminal of the coil, so the voltage is too high for the input on the MicroSquirt. You can, however, swap to a 7 or 8 pin HEI, and use the "R" pin for a tach signal for the MicroSquirt. Leave the "E" and "B" pins disconnected, and it will behave as if it's a 4 pin module with a low voltage tach output.

You might be better off using a standard MicroSquirt as the harness won't be much use for non-GM transmissions. Supported transmissions include:

• GM 4T40E
• GM 4L60E
• GM 4L80E
• Toyota A341E
• Ford 4R70W
• Ford 4R100W (also called E4OD)
• Mitsubishi W4A33

The following have a few experimental installations but do not have full documentation:

• GM 5L40E
• Chrysler 41TE

It does need RPM, but coolant temperature is less critical. The RPM input is a simple pulsed signal; there's several ways you can get this depending on your ignition system.

Yes. This harness fits all but a few very early '90s versions of the 4L80E. We actually developed it using a transmission out of a slightly newer van.

The MicroSquirt is set up to use its VR2 input for the RPM signal. You can often get a suitable signal from the distributor pickup or, if using an MSD type ignition, a tach output on the ignition module.

Sure - this one can use either throttle position or MAP for engine load.

You can use either a TPS or a MAP sensor for engine load.