642B gauges and Instrument panels?

[maxxv412]

I recently purchased a 1990 642B. I am fairly new to the forum and have already used some of the information from this site. I believe the machine has been "modified" by previous owners. There are NO gauges on this unit, only two lights, one for engine and one for hydraulics. I would like to install coolant temp, oil pressure, tach and hydraulic pressure gauges on the bobcat. Does anyone know where the sensors can be installed without drilling new holes?

 

[OldMachinist]

There should already be a sending unit for the coolant temp, for engine oil pressure you'll need to replace the sending unit for the idiot light with ether a sending unit for a gauge or tubing to a mechanical gauge. A tach should come with instruction on how to hook it up. If you want to monitor the hydraulic pressure you'll need to install a tee in the system between the pump and control valve and plumb to a gauge. I really wouldn't recommend the hydraulic pressure gauge. If it developes a leak in the gauge or the line to it you'll have hot hydraulic oil leaking or spraying in the cab.

 

[maxxv412]

There should already be a sending unit for the coolant temp, for engine oil pressure you'll need to replace the sending unit for the idiot light with ether a sending unit for a gauge or tubing to a mechanical gauge. A tach should come with instruction on how to hook it up. If you want to monitor the hydraulic pressure you'll need to install a tee in the system between the pump and control valve and plumb to a gauge. I really wouldn't recommend the hydraulic pressure gauge. If it developes a leak in the gauge or the line to it you'll have hot hydraulic oil leaking or spraying in the cab.

Thank you for your quick reply. Where would I find the sending unit for the coolant? I have looked over the engine and see nothing that looks like a sending unit. There is a "bolt/plug" in the head on the right side between the intake runners. That is the only thing I have seen.

 

[OldMachinist]

Thank you for your quick reply. Where would I find the sending unit for the coolant? I have looked over the engine and see nothing that looks like a sending unit. There is a "bolt/plug" in the head on the right side between the intake runners. That is the only thing I have seen.

My Mitsubishi service manual doesn't show exactly where it screws in it just shows it near the thermostat housing. Item #3 on the diagram below.

 

[maxxv412]

My Mitsubishi service manual doesn't show exactly where it screws in it just shows it near the thermostat housing. Item #3 on the diagram below.

Thank you........Great help. I found the sending unit hidden under intake manifold.