3L to 5L conversion no tacho

[Teritorian]

Hello all,
I just recently bought an LN106 twin cab 97 model, which originally had the natural 2.8 litre (3L), but now has the turbo 3.0 litre (5L)
The problem I have is that the tacho isnt working. is there a fix that anyone knows about?

I am also only getting 400klm to a tank of highway driving....although I think the tank is tiny.

Thanks in advance

[Manxman]

Tacho is electronic, driven by 2 wires on fuel pump. the third wire is the fuel cutoff solenoid, which deactivates to stop the motor. sensor could be faulty. or not connected, bevause the connectors are different. does fuel pump have a round "hat" on top of it, or is it just rectangular from above. That hat is a boost compensator and is necessary to get the most power from the Turboed motor. fuel tank is abt 60L? Then you might have a problem with mileage. check brakes for drag, take unnnecessary weight off car, reduce air drag-roof bars/lights, flapping tonneau cover, windows up at speed, aircon/lights/cabin fan off when possible, my std 5L consistently got 10km/l @ 100kph empty on a 68L tank. My longest run was Perth - Albany - Perth. 420km Unless you are using a lot more power than me (why?) you should be getting similar. fuel consumption is directly related to power produced--3.3KWhr/Liter for typical diesel in good condition. You won't know if the motor is reconned, and you need to start it and whilst idling briefly remove the oil filler cap. and put your hand avove it. The stronger the airflow out of the motor, the worse the rings are, there will be some oil carried out by the air, the more of that ditto. Replace cap and tighten properly-do not overtightem on hot motor, or you won't easily undo it again. If heavy blowby, do compression test and post results in kpa or pis. poor compression ==poor mileage, hot motor and all manner of troubles. Opinion: It's a likely problem, given the age of the engine. See my post some pages back about buying an older hilux-it contains many of the typical problems you may be facing.