Work on the LeMans going slow. Life still getting in the way. Between complications on moving my dad to a new assisted living place and a large order at work, I don't get home until really late. Still . . . .
I did manage to work on the cluster a little each night. Getting closer to being able to install it.
The speedometer is a SpeedHut unit, uses VSS signal from PCM, has digital odometer and trip, can be calibrated separately from the PCM. It's still best to have the PCM read correctly though.
Tach is one of the aftermarket in dash replacements.
Gauges are aftermarket stock appearing replacement.
Oil pressure will read from a stock sending unit adapted to fit the metric fitting at the back of the block. PCM doesn't read the oil pressure.
Fuel gauge is feed from a stock type sending unit mounted in the Rick's gas tank.
Water temperature. I have yet to decide on how the solve this. There are several options.
1) OP amp circuit to convert a LS1 type sender to feed a 68 style gauge. There is a dual temperature sender available that one part would feed the PCM and the other feeds the gauge. In the original application, this would be a 2002 Camaro gauge. This is probably the easiest solution.
2) Custom BCM to read the OBDII signals and convert the PCM water temperature to a signal compatible with the 68 gauge. This solution adds the possibility of custom calibration to make the gauge positions actually mean something. Like calibrate it so that the gauge is in the middle position when the car is at normal operating temperature. There are single chip controllers and OBDII interface chips that make this solution fairly easy. However if I go this way I would program more functions in the computer. Functions such as delayed accessory power, control for the cornering lights. A small display could show any of the PCM parameters, speed, Tach, temp, O2 sensor, intake temperature and probably a dozen more. I think Painless is working on a similar gauge controller. It might be available by the time I need one.
3) I list this just to be complete, but I don't consider it to be very good. There is a plug in the back of the passenger side head. Some have stacked a series of adapters to allow the stock sending unit to be screwed in. The problem is the size of the stock sending unit. The sending unit will be located outside of the cylinder head and will not be in flowing water.
Of course it is possible to get an aftermarket gauge and sending unit that will work in the passenger head, but I wanted the stock gauge to work.
4) While I'm not considering this option, I list it for others. SpeedHut is about to release CAN Gauges. These Gauges connect to the OBDII diagnostic port, and reads out the PCM value. There are Gauges for speed, Tach, water, voltage, etc.