The majority of your wiring harness should simply plug in to your vehicle with out issue. However, you should notice a Dark Green wire coming from the Passenger side rear of the harness marked “Temp. Gauge”. This wire feeds the signal to the coolant temperature gauge in the vehicle’s gauge cluster. The newer vehicles no longer use this type of signal, therefore, they do not have a signal anywhere that can run to this wire for your gauge. It will be necessary to remove the sender from the original engine (Figure 1), or purchase a new one, and place it somewhere in the cooling system of the new engine. A good place for this is in the passenger side head towards the back where a hole is blocked off (Figure 2). This hole can be drilled and tapped for the new sending unit using a 3/8” NPT tap. There are other methods such as multiple adapters, but they often cause issues with the accuracy of the sending unit.
Alternatively, you may choose to drill and tap a hole in the water pump near the filler neck, install a bung in the Radiator, or somewhere inline of a cooling hose. These are all just suggestions, and the vehicle can run without this sending unit being installed at all, the temp. gauge in the dash will simply not work.
AC Delco p/n 21377 (or equivalent) is a common sending unit used for the temp gauges on many 1990-1999 GM vehicles.
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Figure 1 |
Figure 2 |
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