TB42 Tacho

[killer_garden_gnome]

Forgive me for my stupidity but where does the sender for the tacho come from off the engine, im a diesel driver so im pretty uneducated with the TB

[MyGQ]

It is connected to the negative post on the Coil for the tacho pickup.

Since ya a diesel guy, i just swapped from TB42 to TD42. where does the the TD42 pick up its tacho from? mines a GQ 92 model

[killer_garden_gnome]

theres an engine rev sensor on the front of the engine im not sure exactly where coz ive never needed to worry about it but ill check my wiring diagram and get back to u with wat colour wires and location

[MyGQ]

Thanks mate

[killer_garden_gnome]

tryd the negative post and all it did was make the carby cut off solenoid kick in

[killer_garden_gnome]

there should be a two wire plug on top of ur intake right at the front with a yellow/black and a yellow/white in and blue and green out, the blue and green goto the eng rev sensor, the sensor sits between ur water pump and the alt just above the aircon idler pully.

and i just realised i read the drawing wrong so i was hookin the negative coil wire to a yellow and blue not a yellow and black so it prob does work. and u dont know where the oil pressure sending unit is do ya, i found the pressure switch so my oil light comes on but i cant find the sender for the gauge

[MyGQ]

Not sure on the pressure gauge. never had to locate it

[bilby]

Not sure on the pressure gauge. never had to locate it

TB42 pressure sender will be on the drivers side of block near the middle
between the oil filter and fuel pump

[killer_garden_gnome]

yeh nah thats the pressure switch, i seriously cant find the sender for the guage i hooked the switch up to the gauge and it just went all the way to the top, hooked it to the oil light, it came on with the key and went off like it should, might just not be lookin in the right place, then i was also wondering if the engine is out of a model with no oil pressure gauge would it have a sender unit at all? i know the engine is out of an 89 base model

[nastytroll]

oil pressure switch n sender are the same unit, instrument cluster with no oil pres gauge has a 2 wire sender for light only n instrument cluster with oil pres gauge has 3 wire sender
Hope this helps

[nastytroll]

base model will have no oil pres gauge just a idiot light

[killer_garden_gnome]

thanks for that

[bagsy]

hey guys on the plug that goes to the negative side of the coil , can anyone tell me which color wire is for the tacho. Also my engine is the tb42 efi , cheers shane.........

[killer_garden_gnome]

i cant help ya coz mine was an RD28-T converted to a TB42 carby so the wires arent even there. best bet would be to get a gregories manual for a petrol and have a look at the wiring diagram